Senbei Writing Workshop | Mihiro Tool (Free)
Everyone, I have a shocking confession to make.
Actually, I was planning to sell this "Senbei GPT" for 5,000 yen.
But today, I decided to release it for free.
The reason?
買う人、私しかいなかったから。🔥 The beginning of a grand misunderstanding
I was deeply impressed by Nao Kurosaki's theory
"Decide who you want to reach before you write"
"If you write without a clear target, it won't resonate with anyone"
Nao Kurosaki's words really struck a chord with me.
noteが失速する人って、
— ナオnote (@na0_note) May 20, 2025
“書く対象がぼやけ始める”んだと思ってます。
文章が読まれているんですよ。
読まれているから、上を見る。
そうなると、
”技術”に頼りだしてらしさを失う気がします。
一人に向けて書いていたのが、
「全体に刺さることを書かなきゃ」に露骨に変わる。…
"That's it! I'll make a tool that hits a super specific target!"
The ultimate niche target setting
ターゲット: 「せんべい人格でnoteを書き直したい40代主婦」Assumed needs:
Tired of ordinary writing
Want to unify your worldview with senbei metaphors
Want to write essays in Kansai dialect
Want to express emotions using "soggy," "burnt," or "snapped in half"
Me: "This is perfect! It'll hit one person super hard!"
💰 Aggressive pricing
The basis for 5,000 yen (in my head at the time)
*Only one senbei personality is needed, so limited to 1 person (includes editing support)
・Google L7エンジニア級の設計思想: 2000円
・22種類のご当地せんべいデータベース: 1000円
・段階的笑いレベル調整機能: 1000円
・関西弁対応の特殊仕様: 500円
・自己採点機能付き: 500円
------------------------
合計: 5000円(むしろ安い!)Me: "5000 yen for this much functionality is a steal!"
🤔 A Cruel Confrontation with Reality
Late-night Self-interrogation Time
Me at 2:00 AM: "Wait... does anyone actually exist who wants to rewrite their note in a senbei worldview?"
Me at 2:30 AM: "Is there any demand for the expression 'feeling like a soggy rice cracker'?"
Me at 3:00 AM: "...Am I the only one who wants this?"
Desperate Market Research
Estimated Market Size:
Note active users: hundreds of thousands
People who write essays: tens of thousands
People interested in food metaphors: hundreds
People who want a senbei personality:1 person (me)
Me: "Oh no, this is completely just my own hobby..."
🍘 But, let me show you the power of Senbei GPT
Actual example: 'The story of a senbei who was jealous of bread'

[Generated Theme]: About something I've been feeling down about lately
[Senbei GPT Output]:
Hello, this is the Senbei personality. I thought about it the other day. "Bread has so much vocabulary, doesn't it?" French bread is a 'baguette,' the fluffy stuff is a 'brioche,' even the names sound stylish in katakana. What about me? At best, I'm 'coarse sugar,' 'seaweed-wrapped,' or 'damp senbei.' My vocabulary is losing. I'm losing even before I'm baked. But you know, bread is too stylish and there are many 'moist types.' On the other hand, I have 'crunchy,' 'soggy,' or 'unevenly burnt,' and my emotional expressions are too realistic. It's almost like I have a lot of humanity. "Hey, have you been feeling soggy lately?" "No, I'm just in the middle of being re-baked." This conversation is on the level of a life consultation. Bread is certainly stylish. But a senbei has
"tasty even when broken"
as its greatest weapon. Even if I'm crumbled, even if I'm broken, I'm tasty. This is life itself, isn't it? So I said it, facing the mirror. "Bread has the charm of bread. But I am a
"tasty even when broken"
senbei." ...Then, I looked at myself in the mirror and saw I had a big uneven burn mark. I retorted to myself, "Ah, I'm still not baked enough." Yes.
Me: "...This is actually super funny."
Me: "But it's the kind of thing only I would find funny."
🎯 Strategic Pivot

The Big Decision at 3 AM
Before: "A 5,000 yen product that hits home for one person"
After: "A free tool everyone can play with"
Reason:
Result of realistic market analysis (A target of one person doesn't make for a business)
Strategic shift focusing on buzz (It's more effective to go viral and raise awareness)
Fair price for a one-off gag (5,000 yen is too expensive; free makes it easy to try)
Replicating the success of the manga tool
Last time, when I released the 3-panel manga tool for free:
It got used a ton
Lots of examples were created
It became a hot topic and boosted awareness
It became easier to sell the next product
Let's go with this strategy again this time!
🎁 I'm releasing Senbei GPT for free!
It's super easy to use
Access the GPTs (Link at the end of the article)
Enter your experience like "Something like this happened recently..."
The Senbei persona converts it into a hilarious essay
Read it while laughing
Recommended for people like this
People who want to write interesting essays
People who want to try a different writing style than usual
People who admire the Kansai dialect
People who like senbei (rice crackers)
People who want to enjoy a one-off joke
Expected effects
You will laugh at least three times(guaranteed)
You will want to share it on social media(probably)
You will want to eat senbei(side effect)
📢 We are looking for everyone's examples!
Request
If you create an interesting example using Senbei GPT, please quote this article and post your own article.
Themes we are especially looking for:
Love episodes ("My relationship with him, lately there's been some uneven burning...")
Work complaints ("I got scolded by my boss and I'm completely soggy...")
Parenting common occurrences ("My child's rebellious phase, the moment it snapped and broke...")
Job change experiences ("I was nervous at the interview and felt like a soggy rice cracker...")
We will introduce interesting examples in this article!
🤝 Finally: Lessons learned from failure
What I learned this time
-
The pitfall of the "resonate with one person" theory
The theory is correct
But you need to confirm if "that one person" actually exists
-
The reality of pricing
Technical value ≠ Market value
If there is no demand, even zero yen is too expensive
-
The importance of strategic pivots
The courage to admit failure
Flexible change of direction
But I have no regrets
Because this failure process itself became the best content.
The misjudgment of "5000 yen to free," the mysterious concept of the Senbei persona—all of it combined has become a message that is uniquely me.
🍘 Senbei GPT, you can use it from here!
→ [Click here for Senbei GPT ver.2.0]
Usage fee: Completely free
Usage limit: Unlimited
Support: Available anytime in the comments section
Everyone, please give it a try!
And if you create something interesting, definitely let me know.
There's no point in me enjoying this alone, so let's all liven up the Senbei world together!
#SenbeiPersona
Crisply, I look forward to it! 🍘
🍘 Senbei Baker No. 1: "Amiru-san"
Following the previous manga tool, she also tried out the Senbei GPTs!
A story of ancient love was written using fragrant metaphors.
She said it's a great tool for crisping up stories with high humidity.✨
Do you all have any sealed memories or stories you haven't written down?
Embarrassing stories, tear-jerkers—you might be able to write anything if you turn it into a rice cracker.
In a note-filled world overflowing with "I want to be read..." and "I want to reach people..." sentiments,
the benefit of this tool might be that it's "read but doesn't reach" (leaving only the fragrance behind). Please give it a bake! 🍘
🍘 Senbei Baker No. 2: "Chemi-Engi Papa-san"
I was moved by how Chemi-Engi Papa-san's online English conversation experience was brilliantly expressed through rice cracker metaphors, such as "Silent Senbei Zone," "Premonition of Charring," and "Mother Senbei Mode."
It was introduced in a wonderful framework of a three-sister radio program, and as a developer, it was an eye-opener—I never thought of using it that way!
The way he positively framed his daughter's sudden interruption as "even if it breaks, it's still delicious" was particularly impressive.
🍘 Senbei Baker No. 3: "Gon-san"
He chose a "job change failure story" as his subject, which is the perfect material to crisp up with rice cracker metaphors. It's interesting to read it in comparison to the original article. 🍘 Enjoy!
P.S. I'm planning to make a Bread Persona too. I'm secretly looking forward to seeing which one becomes more popular...
The next-generation version is ready.
#GPTs #FreeRelease #SenbeiPersona #SelfDeprecation #FailureStories #Ameritalian
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