Countdown Pulse

A clean classroom with wooden desks and chairs lined up.
High school life starts today.
I chose this school because it didn't have any P.E. or clubs, which I'm not good at.
I'm not great at studying either, but I'm sure I'll manage somehow.
However, the homeroom teacher said something unbelievable.
"You will all be wearing pulse watches. The count starts at 150 million. Any student whose count reaches zero will have to repeat the year."
...What the hell is that?
A pulse is 60 to 100 beats per minute.
If I calculate it at an average of 80 beats, that's 4,800 beats per hour.
About 110,000 a day, about 42 million a year, and about 120 million in three years.
There's no exercise at this school, and I have an extra 30 million, so I should be fine.
At the time, that's what I thought.

...How many times have I had to repeat the year since then?
Falling for someone caused my count to drop all at once, and I fell for the honey trap of the sexy nurse in the infirmary...
Before I knew it, I had become a man in my thirties.
Excitement is sinful and drives one's life to ruin.

I participated in the project by Tarahakani-san.
Details can be found in the following article.