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How to Earn Your First 10,000 Yen Selling Unwanted Items: A Complete Guide for Side Hustle Beginners with No Skills


Introduction

"I want to start a side hustle and earn an extra 10,000 to 20,000 yen a month in spending money."

"But I don't have any programming or web design skills, or any special experience at all..."

As someone who tests and shares the latest IT and AI tools daily, I was once just like you, reading this article, feeling down and thinking, "I don't have the talent to earn even a single yen on my own."

If you search for "side hustle for beginners," you'll be flooded with attractive phrases like "earn automatically using AI" or "make 100,000 yen a month immediately with web writing." But when you actually try to start, you hit a wall of technical knowledge and end up closing your phone without having started anything at all...

However, I will give you the conclusion. You don't need any professional skills like programming, certifications, or social media followers.

I simply listed items that were sleeping in my house—things that looked like trash—using my smartphone, and I was able to use my spare time to immediately turn my first 10,000 yen into cash.

I didn't sell luxury brand items or expensive gadgets. I just rummaged through my house and found things that were "practically trash I was about to throw away."

Target Audience for This Article

I wrote this article to serve as a "trigger to take the first step" for people like the following.

*副業に興味はあるけれど、売れるスキルも実績もなくて諦めている方
*「売る物がない」と思っていて、不用品販売に踏み出せていない方
*メルカリを開いたことはあるが、出品や発送が面倒で放置している方
*自分の力で「最初の1万円」を稼ぐ成功体験を味わってみたい方

Benefits of Reading This Article

If you read this article to the end and act as described, these changes will come to you.

*「我が家は宝の山だった」と気づき、家の中を見る目がガラリと変わる
*「こんなの売れるわけない」と思っていたものが、実際に現金に化ける
*写真撮影から本文作成まで「3分」で完了する出品テンプレが手に入る
*値下げ交渉やトラブルに怯えず、ストレスゼロでやり取りできるようになる
*自分の力で「最初の1万円」を稼いだという揺るぎない自信が手に入る

A sneak peek at the "most intriguing point" revealed! Why did half-used cosmetics sell immediately at a price close to the retail price? What is the identity of the "surprisingly unexpected buyer" who wants cords from broken, non-working appliances? What is the "divine listing template" exclusively for copy-pasting that finishes tedious description writing in an instant? Just by "knowing or not knowing" this, you decide whether the things in your house become "just trash" or "cash (Yukichi)."

Table of Contents

Chapter 1: Why do you fail when you try to sell "clothes and books"?

  • The "unwanted item sales trap" everyone falls into, and the shift in thinking needed to earn 10,000 yen

  • The reality that even if you list clothes you no longer wear or books you've finished reading, "only a few dozen yen remain after shipping and fees."

  • What you should target is not "things that look clean and valuable," but "things that solve someone's niche problem."

  • The reason why it wasn't that you "had nothing to sell," but that you "didn't realize what could be sold."

Chapter 2: [Shocking Real-Life Examples] "Wait, this sells?" 10 Treasures I Turned into Cash at Home

  • [Example 1] The "Magic Keywords" That Sold Half-Used Cosmetics and Perfume in an Instant

  • [Example 2] The Secret Trick to Selling Broken Appliances and Old Cords for a High Price as "Junk"

  • [Example 3] How to Monetize Ordinary Paper Bags, Empty Boxes, and Novelty Items by Selling Them as a "Set"

  • [Example 4] Rescue Tactics for Children's Toys with Missing Parts and Duplicate Gachapon Items

  • [Example 5] The Surprising Demand for Old Documents, Instruction Manuals, and Remote Controls About to Be Thrown Away

  • ...plus 5 more, including a "Treasure Mountain Excavation Checklist for Your Home"!

Chapter 3: [3-Minute Task] "Instant Listing Templates & Photography Techniques" That Sell Even with Zero Writing Skills

  • A Cheat Sheet for Lighting and Backgrounds to Take "Must-Buy" Photos with Your Smartphone in 1 Minute

  • [Copy-Paste OK] The "Universal Product Description Template" That Eliminates Buyer Anxiety

  • The "Title Keyword Construction Method" That Triples Your Search Results

Chapter 4: [Zero Stress] God-Tier Response Techniques to Perfectly Fend Off Price Negotiations and Complaints

  • The "Lowest/Highest Price" Pricing Logic to Instantly Gauge Market Value and Avoid Losses

  • God-Tier Reply Scripts to Shut Down Rude "Can you lower the price?" Comments in One Go

  • 100-Yen Shop Packing Techniques to Minimize Shipping Costs and Maximize Profits

Chapter 5: [Complete Roadmap] Start Today! A 7-Day Intensive Plan to Earn Your "First $100"

  • [DAY 1-2] Treasure Hunt Start! Gather "$100 Worth of Candidates" from Inside Your Home

  • [DAY 3-4] Just Paste the Template! Let's Start by Listing 3 Items

  • [DAY 5-7] Fine-Tuning Methods for When Items Don't Sell & The Moment You Reach $100

  • What You Will Learn in This Article & Who Doesn't Need This Article

  • I will reveal, without holding anything back, real-life examples of unexpected items that actually sold and how to find them.

  • *This is not about high-end brand resale know-how or shady sourcing techniques. It can be completed using only things you have at home.

Chapter 1: Why do you fail when you try to sell clothes or books?

Key points of this chapter
Clothes and books are oversaturated with competitors and have extremely thin margins. The structure is set up so you will burn out from the work before you earn 10,000 yen.
・The trick to earning is not to target "pristine items," but to target niche unwanted items that solve a specific person's "problem or desire" instead.
・With 3 steps that focus on "utility" rather than "condition," your home will turn into a treasure trove with profit margins of over 70%.

To beginners struggling with "I listed it, but it just won't sell..."

"Let's start by listing the clothes I don't wear anymore or the books I've finished reading."

Almost everyone who starts selling unwanted items takes this action first. And 90% of beginners who are "struggling because they want to earn their first 10,000 yen from a side hustle, but nothing they list sells and they aren't making a profit, so they feel like giving up" end up quitting right here.

  • "I get 'likes,' but it never sells..."

  • "I felt terrible after someone negotiated a huge price cut in the comments."

  • "It took me 30 minutes to pack and ship it, but I only ended up with 80 yen..."

Don't you have some experience with this? While clothes and books might seem familiar and easy to sell at first glance, they are actually the "hellish red ocean" where beginners are most likely to fail.

I will explain in detail the "structural rules" behind why you can't earn 10,000 yen with clothes or books, and the "paradigm shift steps" you can put into practice right now.

The fatal reason why you will burn out if you aim for 10,000 yen with clothes or books

First, let's look calmly at the "numbers" to see why clothes and books don't make money.

For example, let's say you list a piece of clothing you bought a few years ago from a fast-fashion brand (original price around 4,000 yen).

  • Selling price: 800 yen (non-brand or used clothes rarely sell for more than this)

  • Commission (10%): -80 yen

  • Shipping (due to thickness, Takkyubin Compact/Yu-Packet Plus, etc.): -450 yen to -520 yen

  • Packing material costs: -70 yen

  • Profit remaining: only "150 yen to 200 yen"

To earn 10,000 yen, you would have to sell as many as 50 to 60 items of clothing.

Ironing 50 pieces of clothing one by one, taking multiple photos, measuring them, writing descriptions, and once they sell, folding them neatly into bags bought from a 100-yen shop and heading to the post office... When converted to an hourly wage, it's only a few dozen yen. It is only natural to feel discouraged, thinking, 'Is this all I get for so much hard work?'

Books are the same. While shipping for paperbacks and business books is cheap (210 yen via Nekopos, etc.), the resale market price often crashes to 300–500 yen, so the profit per book is only about 50–100 yen.

In other words, choosing clothes or books simply because 'everyone else is selling them' or 'they seem easy to sell' is the biggest trap of all.

A 3-Step Mindset Shift for Beginners to Aim for a 'Profit Margin Over 70%'

So, how can you earn 10,000 yen quickly with less effort?

The answer is simple. Stop looking for 'things that look clean and valuable' and shift your focus to 'things that solve someone's niche problem or desire'.

The essence of earning money by selling unwanted items lies in the following 3 steps. Update your mindset right now.

[Step 1] Search by 'Clear Purpose' rather than 'Good Condition'

When looking for clothes or books, you check their 'condition,' such as 'are there any stains?' or 'is it trendy?' However, the items you should target from now on are those where it is clear 'who will use them and for what purpose.'

  • × Clothes/Books: Buyers have abstract desires like 'I want cheap clothes' or 'I want to read books cheaply' (= high competition leads to price wars).

  • ○ Niche Unwanted Items: 'I lost this specific part of that appliance and I'm in trouble' or 'I want to try using this just a little bit'—these are urgent and specific problems.

Buyers with urgent problems will think, 'I want it now!' and make an immediate decision to purchase, even at a slightly higher price. Therefore, there is no need for pointless price negotiations.

[Step 2] If it doesn't sell as a 'single item,' create value by making it a 'set'

Even items that have no value individually and would result in a loss due to shipping costs can turn into 'valuable products' when bundled together.

For example, McDonald's Happy Meal toys or capsule toy prizes. If you list them individually, you'll lose money on shipping, but if you sell them as a '10-piece set' or 'same series bundle,' collectors or parents raising children will buy them for 1,500 to 2,000 yen.

[Step 3] Only list items that will yield a 'profit of 500 yen or more'

Before listing, always calculate 'Expected Selling Price - (Fees + Shipping + Packaging Costs)' and only list items that will leave you with 500 yen or more in your pocket. If you sell products with a profit of 500 yen or more, you can reach 10,000 yen by selling just 20 items. Compared to selling 60 pieces of clothing, the workload is only one-third.

Find Treasures in Your Home with the 'Excavation Checklist'

Treasures are sleeping among the things you usually overlook, thinking, 'This is just trash, nobody would buy it,' or 'It would probably cost money just to throw it away...'

In the following Chapter 2 (paid section), I will reveal 10 real-life examples of unwanted items from my own home that actually sold—items that will make you doubt your ears, saying 'Wait, this sold!?'—along with explanations and a 'Treasure Trove Excavation Checklist for Your Home'.

Chapter 2: [Shocking Real-Life Examples] 10 Treasures I Turned into Cash at Home That Will Make You Say, 'Wait, This Sells!?'

Key points of this chapter
Niche unwanted items that look like 'trash' at first glance are the true treasures for high profit and quick sales
・Target the demand for 'wanting to try it out,' 'just needing the parts,' or 'wanting to collect them all at once'
・Use the 'Treasure Trove Excavation Checklist for Your Home' to search your house right now

10 'Treasures' I Actually Turned into Cash at Home

[Example 1] Half-used cosmetics and perfumes (Selling price: 1,200 yen - 2,500 yen)

  • Reason it sold: Strong demand from people who 'want to test if it suits their skin' or 'want a trial size because the regular price is high'.

  • Tips & Keywords: Clearly state 'Trial,' 'Remaining amount (percentage),' and 'Date of purchase,' and take photos with a focus on cleanliness.

[Example 2] Broken home appliances, old cords, and junk items (Selling price: 1,000 yen - 3,000 yen)

  • Reason it sold: Technicians looking to extract repair parts or people troubled by losing a specific cord.

  • Tips & Keywords: Be sure to include 'Junk item,' 'For parts,' and the 'Model number' in the title.

[Example 3] A set of brand-name paper bags, empty boxes, and novelty items (Selling price: 1,500 yen - 2,500 yen)

  • Reason it sold: Demand for gift wrapping materials, interior decor, and storage purposes.

  • Tips & Keywords: Instead of selling them one by one, sell them as a 'bulk set' of 5 to 10 items.

[Example 4] Children's toys with missing parts or duplicate Gachapon items (Selling price: 1,200 yen - 2,000 yen)

  • Reason it sold: Parents who lost specific parts or collectors who want to complete a series.

  • Tips & Keywords: Include the character name or series name accurately in the title.

[Example 5] Old instruction manuals and remote controls sold separately (Selling price: 800 yen - 1,800 yen)

  • Reason it sold: People who bought the appliance body secondhand or those troubled by a broken remote control.

  • Pro Tip/Keyword: Include model number compatibility in the description.

[Example 6] Bundled used stationery and art supplies (Selling price: 1,000 - 1,800 yen)

  • Reason it sold: People wanting to stock up cheaply for the new school term or to try out a hobby.

[Example 7] Samples, trial products, and hotel amenities (Selling price: 800 - 1,500 yen)

  • Reason it sold: Bulk purchases for travel or trial use.

[Example 8] Near-expiry point redemption prizes and novelty goods (Selling price: 1,000 - 2,200 yen)

  • Reason it sold: Collectors of limited-edition, not-for-sale items.

[Example 9] Buttons and brand tags from worn-out clothing (Selling price: 500 - 1,200 yen)

  • Reason it sold: For handmade projects or repairs.

[Example 10] Empty bottles of high-end perfume (Selling price: 800 - 1,500 yen)

  • Reason it sold: For room interior decor and display.

Checklist for Excavating Your Home's 'Treasure Trove'

When searching your home, try checking the following locations and items!

 [ ] 洗面所・メイクタワー**:半分使ったコスメ、香水、美容家電の付属アタッチメント
 [ ] リビング・テレビ裏**:使っていないリモコン、型番不明のケーブル・充電器
 [ ] クローゼット・押し入れ**:ブランドのショップ袋、箱、ノベルティグッズ
 [ ] 子供部屋**:パーツがバラバラのおもちゃ、ガチャガチャのダブり
 [ ] 書斎・引き出し**:家電の取扱説明書、古いスマホの空き箱・説明書

Chapter 3: The '3-Minute Listing Template' for People Who Are Bad at Photos and Hate Writing Descriptions

Key points of this chapter
The seemingly tedious tasks of 'photography and writing' can be shortened to just 3 minutes per item by using a template.
・ 'Instagrammable' photos are unnecessary. A 'background that hides daily life' and 'disclosing scratches without hiding them' are the keys to quick sales and high ratings.
・ Includes a complete set of 'versatile product description templates' you can copy and paste, and 'title rules' that get picked up in searches.

To beginners who worry, 'Listing work is so tedious that I don't even want to open the app...'

'I want to sell my unwanted items, but taking photos one by one, thinking of long descriptions, and typing on the keyboard is just so tedious...'

There are many beginners who give up due to the high hurdle and tediousness of the listing process, and end up leaving the unwanted items they worked so hard to collect in the corner of the room..

In particular, there is absolutely no need to worry about 'not being confident in your writing skills' or 'not being able to take stylish, Instagrammable photos.' This is because what buyers on flea market apps are looking for is not 'SNS-style aesthetics,' but only 'whether the information they want is listed accurately and clearly.'

In this chapter, I will teach you super-efficient techniques to finish everything from shooting to listing in 'just 3 minutes per item,' along with 'god-tier templates' that you can copy and paste as-is.

[Step 1] 1 minute on your smartphone! 3 secrets to taking photos that make people want to buy

Professional photography equipment or stands are 100% unnecessary. There are only 3 rules for quickly taking "photos that sell" with just one smartphone.

1. The background should be a "plain wall" or "white drawing paper" only

If your floor or a messy room is visible, buyers will immediately feel uneasy. Just by using a large piece of white drawing paper from a 100-yen shop or a plain, clean wall as a backdrop, the cleanliness of the product will increase significantly.

2. Take photos using "sunlight (near a window during the day)"

Taking photos under room fluorescent lights can cause shadows or colors that differ from the actual product, leading to trouble. The golden rule is to take photos near a window in sunlight (in a position that avoids backlighting) between the morning and early afternoon on a sunny day. This alone makes the product's appeal look 30% better.

3. Intentionally zoom in on "scratches, dirt, and remaining amount" without hiding them

Thinking "maybe it won't sell if I show the scratches..." and hiding them is counterproductive. By intentionally taking close-up shots of scratches, scuffs, or the remaining amount and stating "here is the scratched part," buyers will feel that you are an "honest and reliable seller" and can press the purchase button with peace of mind. This also directly leads to preventing trouble.

[Step 2] Done with copy and paste! "Universal product description template"

It takes time because you are thinking of sentences from scratch. Just copy the text within the frame below and rewrite the parts in brackets to complete a perfect description.

ご覧いただきありがとうございます!

【商品名】
〇〇(メーカー名・商品名・型番など)

【状態】
・〇年ほど前に購入(または譲り受け)したものです。
・使用に伴う小傷やスレはありますが、使用・動作には問題ありません。
・状態の詳細は写真(〇枚目)にてご確認ください。

【セット内容・付属品】
・本体
・(※箱や説明書、コード類があれば記載。なければ「写真に写っているものが全てです」と記載)

【おすすめポイント】
・(※「お試しで使ってみたい方」「パーツ探しの方」「まとめ買いしたい方」などターゲットを一言)

【発送・その他】
・アルコール除菌・簡易清掃のうえ、丁寧に梱包して発送いたします。
・即購入OKです!早い者勝ちでお願いいたします。

If you can use AI tools like ChatGPT or Gemini, you can generate text in 5 seconds just by using this template and giving the instruction, "Based on the text below, create a Mercari listing description." You can completely eliminate the stress of thinking about sentences yourself!

[Step 3] The "Title Construction Law" that makes views jump 3 times higher

No matter how perfect your photos and descriptions are, if the title is just "unwanted item" or "vacuum cleaner," it won't show up in searches.

The golden rule is to pack the title to the limit of the character count (40 characters) in the order of [Limited Word] + [Official Name/Model Number] + [Search Keyword (Condition/Usage)].

  • × Bad title: Panasonic Hair Dryer Used

  • 〇 Profitable title: [Immediate Purchase OK] Panasonic Hair Dryer EH-NA99 Junk/For Parts

Just by adding "problem/purpose keywords" that buyers type into the search bar, such as "junk," "trial," "bulk sale," "genuine product," or "parts," to the end of the title, your access count will jump to more than three times higher at once.

What do you do after completing the "setup" with a 3-minute listing?

Once you have turned the listing process into a template, all you have to do is line up the target items in your house on the flea market app one after another.

However, what you will definitely encounter after listing is "responding to price negotiation comments" and "deciding on pricing when items don't sell."

  • How should you respond to a rude comment asking, 'Can you give me a 1,000 yen discount?'

  • What is the 'proper way to set market prices' to maximize profit in the shortest time?

In the next Chapter 4, I will thoroughly explain 'God-tier response templates' that eliminate reader stress,andthe 'pricing logic that ensures you don't lose money.' Keep reading to start collecting revenue without unnecessary stress!

Chapter 4: Don't Be Afraid of Price Negotiations or Complaints! Pricing and Interaction Techniques That Prevent Losses

Key points of this chapter
Don't rely on intuition for pricing; scientifically determine the upper and lower market limits using 'sold-out searches' on flea market apps.
・Handle annoying price negotiations in 10 seconds without causing friction using a 'gratitude + concession + deadline' reply template.
・Minimize packaging costs and shipping fees, 'proactively prevent' unexpected complaints, and ensure you keep every last yen of profit.

To beginners worried that 'I'm too scared of price negotiations and interaction troubles to get started...'

'I tried listing an item, but I'm scared because a stranger sent a rude price-reduction comment...' 'What if I get a complaint saying there was a scratch after I shipped it...'

Although you are prepared to list your unwanted items,there are truly many beginners who stop in their tracks because they feel intense anxiety and stress regarding interactions with unknown buyers, price negotiations, and post-shipping troubles.are truly numerous.

However, I can state this clearly: interactions on flea market apps are exhausting because you respond with emotion.If you decide on rules and patterns (templates) in advance, you can reduce stress to absolute zero.

In this chapter, I will thoroughly explain everything from the logic of pricing to maximize profit, to God-tier response templates you can use in the comment section, and interaction techniques to perfectly prevent complaints.

[Step 1] Don't Lose Money! 'Scientific Pricing Logic' Decided in 1 Minute

Listing an item with a price like 'I don't know how much to list it for, so I'll just pick something random' is a no-go. It will either be too high and ignored, or too low, causing you to lose money in increments of hundreds of yen.

You can determine the market price in an instant using the following 3 steps (the Sold-Out Search Method).

  1. Filter search results by 'SOLD OUT' Enter the product name in the search bar and check the 'Sold Out' box in the filter function.

  2. Check the 'recent market price' for items that have sold recently Check the price range of items in the same condition (junk, used, scratched, etc.) that have sold within the last 1-2 weeks.

  3. List at a price of 'Recent Market Price + 10%' For example, if many have sold recently for 2,000 yen, list it for2,200 yen to 2,300 yen. This '10% markup' serves as the 'cushion' for the price negotiations mentioned later.

[Step 2] 10 Seconds with Copy-Paste! God-Tier 'Price Negotiation' Response Templates

Once you list an item, you will almost certainly receive comments like 'Can you do it for XX yen?' or 'Is a discount possible?' There is no need to worry about these one by one.

Depending on the situation, please copy and paste the following templates to reply.

Pattern A: When you want to accept the offered price (within a range you can compromise on)

コメントありがとうございます!
本日即決していただけるようでしたら、ご提示いただいた〇〇円までお値下げ可能です。
価格を変更いたしますので、そのままご購入にお進みください。
※専用出品には対応しておりませんので、お早めのご手続きをお願いいたします!

Pattern B: When you want to decline or suggest an intermediate price

コメントありがとうございます!出品したばかりのため、そこまでのお大幅なお値下げは現在考えておりません…。
ですが、せっかくコメントをいただきましたので、〇〇円(※自分が納得できる希望額)まででしたら本日限定でお値下げさせていただきます。
ご検討いただけますと幸いです!

Tip: By
setting a deadline and conditions such as 'Today only' or 'If you can decide immediately,' you trigger a sense of scarcity in the buyer—the feeling that 'if I don't buy it now, someone else will'—which leads to an immediate purchase.

[Step 3] 'Three Preventive Measures' to Achieve Zero Complaints and 'Shipping Optimization'

90% of 'trouble after the item arrives (lower ratings, return requests)' stems from a lack of expectation management beforehand.

1. Describe flaws in the description to the point of 'overdoing it'

Clearly write negative points in bold, such as 'Operation not verified' or 'There are scuffs overall.' Creating a gap where the buyer feels 'It was cleaner than I expected!' is the biggest secret to winning a 5-star rating.

2. 'Choosing a shipping method' to cut costs to the limit

The biggest key to keeping your profit is 'shipping costs'.

  • Thin items (within 3cm thick): Nekopos/Yu-Packet (approx. 210-230 yen)

  • Thick/heavy small packages: Takkyubin Compact/Yu-Packet Plus (approx. 450-520 yen + cost of dedicated box)

Buy a thickness measuring ruler at a 100-yen shop and be sure to check whether it 'exceeds 3cm' before shipping. If the shipping size increases due to exceeding the thickness, the shipping cost will jump by over 500 yen at once, wiping out your profit.

Once you've eliminated unnecessary stress, all that's left is to 'put it into practice'!

Now that you have the pricing logic and reply templates, there is nothing left to fear on flea market apps. Interactions with others become routine, and all that remains is the pleasure of seeing sales come in.

You have all the 'knowledge' and 'tools' you need.

In the final Chapter 5, I will provide a complete roadmap (daily action plan) so that you can start moving without hesitation immediately after reading and get your 'first 10,000 yen' in just 7 days.

Proceed to the final chapter now and take your first step!

Chapter 5: Start Moving Today! A 7-Day Action Plan to Your 'First 10,000 Yen'

Points of this chapter
A daily roadmap that takes you from 'knowing' the know-how to knowing exactly 'what to do today' without hesitation
・The first action takes only 15 minutes. Lower the hurdles to the limit to break through the 'I can't take action' version of yourself
・Grab the success experience of having your 'first 10,000 yen' left in your account just by running the PDCA cycle of listing, shipping, and price adjustment for one week

For beginners who are worried, 'I understand how to do it, but what should I start with?'

'I understand the know-how and templates. But, what should I actually start with after work (or on my day off) today...'

Even after reading this far, there are quite a few beginners who cannot visualize the specific steps to take today or tomorrow, end up procrastinating, and finish without ever taking action.

No matter how much excellent knowledge or how many templates you acquire, you won't earn a single yen if you don't put them into practice. However, getting overly enthusiastic and thinking, "I'll list all my unwanted items this weekend!" is a recipe for failure.

The key is to break the work down into small pieces over 7 days, turning it into "ultra-small steps" of 10–15 minutes a day that you can incorporate into your life.

In this chapter, I will provide a complete roadmap that will allow you to start moving without hesitation from today and have your first "10,000 yen" in your hands in one week.

[7-Day Action Plan] The Shortest Route to Achieving 10,000 Yen in Sales

By simply following the schedule, you can breeze through to achieving 10,000 yen without even having to think.

【DAY 1〜2】宝探し&仕分け(目安時間:各15分)
【DAY 3〜4】写真撮影&一括出品(目安時間:各30分)
【DAY 5〜6】値下げ&コメント対応(目安時間:各5分)
【DAY 7】  梱包・発送・売上金確認(目安時間:20分)

[DAY 1] Search through just one "forbidden drawer" (Time required: 15 minutes)

Searching the entire house at once is a no-go. First, decide on just one small area, such as a "desk drawer," "under the bathroom sink," or "a box in the back of the closet."

  • To-do:

  • Turn over your cosmetic shelf, old smartphone boxes, or bags filled with cords.

  • Take items that fit the "Treasure Checklist" introduced in Chapter 2 (partially used cosmetics, old remote controls, unused cords, etc.) and just toss them into a single cardboard box (or paper bag).

  • Goal: Find 3 to 5 candidates for listing.

[DAY 2] Calculate profit using "sold item search" (Time required: 15 minutes)

Check how much the items you collected on DAY 1 are actually selling for.

  • To-do:

  • Use Mercari's "sold item search" to check the market price.

  • Follow the logic in Chapter 4 and calculate "Selling Price - (Fees + Shipping + Packaging Costs)."

  • Pick up items that will leave you with 500 yen or more.

  • Goal: Finalize the items so that the total estimated profit is "10,000 yen or more" (e.g., 1,000 yen profit x 10 items, or 2,000 yen profit x 5 items).

[DAY 3] Take photos of everything in sunlight (Time required: 30 minutes)

It is inefficient to photograph and list items one by one. Separate the "photography" and "listing" tasks into different days.

  • To-do:

  • On a sunny morning or early afternoon, lay out a "white sheet of drawing paper" by the window.

  • Take photos of the confirmed items (5–10 items) (overall view, back, close-ups of scratches or remaining amount) by taking continuous shots with your smartphone.

  • Goal: Complete photography for all items and save them to your smartphone's album.

[DAY 4] Complete all listings at once using templates! (Time required: 30 minutes)

Use the saved photos and templates to list your items on the flea market app.

  • To-do:

  • Copy and paste the "Universal Product Description Template" from Chapter 3 from your notepad.

  • Rewrite only the bracketed parts (condition, model number, accessories), pack the title with search keywords, and list the item.

  • Goal: List all prepared items and wait for listing notifications.

[DAY 5–6] 100-yen price reduction & excellent customer service comments (Time required: 5 minutes per day)

After listing, make minor adjustments to maintain traffic and ensure quick sales.

  • To-do:

  • For items that haven't sold after 24 hours, "reduce the price by 100 yen" between 8:00 PM and 10:00 PM (due to app specifications, this will bump the item back to the top of the timeline).

  • If you receive a price negotiation comment, reply in 10 seconds using the "Excellent Service Template" from Chapter 4.

  • Goal: Check notifications and generate sales.

[DAY 7] Get a 5-star rating with careful packaging and shipping! (Time required: 20 minutes)

Once the item is sold, it's time for the final touch.

  • What to do:

  • Clean and pack items using materials prepared from a 100-yen shop (bubble wrap, envelopes, etc.).

  • Ship via Mercari delivery from a convenience store or PUDO station (unmanned parcel locker).

  • Send a shipping notification from the transaction screen and wait for the buyer's rating.

  • Goal: Experience the sense of achievement when the sales proceeds are reflected and your 'first 10,000 yen' appears on the screen!

The 'World' That Awaits After Executing the Action Plan

This 7-day plan is not just about 'tasks to earn 10,000 yen'.

The process of moving your hands for even 15 minutes a day to turn unwanted items into cash is, in itself, a solid success experience (a foundational experience) of 'earning 1 yen on your own, outside of your company salary'.

  • 'Something I thought was trash and was going to throw away sold for 1,500 yen!'

  • 'A stranger was happy to buy something I created with my own ingenuity, photos, and descriptions!'

Once you experience this feeling, your values regarding money and the hurdles to starting a side hustle will change completely.

Conclusion: 10,000 yen may not seem like much, but it is significant. The experience of earning it on your own will change your life.

Thank you very much for reading this far.

What I want to convey at the end is that the value of the know-how shared in this article is not just about 'having 10,000 yen in cash in your hand'.

The biggest achievement is gaining a solid success experience of 'generating money from scratch through your own judgment and actions, without relying on a company or organization'.

The weight of '10,000 yen' is completely different from 10,000 yen in salary.

The salary you receive as an employee is deposited as compensation for providing your time and labor. However, the 10,000 yen you earn from selling unwanted items is '10,000 yen earned by your own ability,' obtained by identifying value with your own eyes, taking creative photos, and writing descriptions.

  • 'I thought I had nothing, but there was a mountain of treasure in my house.'

  • 'With a little ingenuity, things I thought were trash turned into cash.'

  • 'A stranger was happy with what I listed, thanked me, and bought it.'

Once you experience this even once, the way you see the world will change completely. A small sense of confidence that "I have the power to earn money too" will sprout, and your anxiety about money and fear of side hustles should simply fade away.

This successful experience will become your "ultimate weapon" for the next step in your side hustle.

The "unwanted item selling skills" you have acquired this time are the foundation (a microcosm of the market) for all side hustles.

  • Marketing: Researched what kind of people have niche problems

  • Writing: Crafted titles and descriptions that make people want to buy

  • Customer Support: Won trust through polite communication

Having experienced this series of processes, you are no longer just a "complete beginner."

From here on, if you decide to start a blog, try web writing, or want to share your experiences on social media, this success and the skills you gained will become your "ultimate weapon" that will always support you.

Since I, who had "zero knowledge and zero skills" in the past, was able to do it, there is no reason why you, who have read this far seriously, cannot do it too.

Why not start today by opening just one desk drawer?

I am rooting for your first step toward your "first 10,000 yen" with all my heart!


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