You graduated a long time ago to become a teacher, and then you decided to teach at a high school not far from home, and the first few years were tough...

The students were disrespectful, annoying, and even mean, but this year, your new students are quite respectful, and strangely enough, almost no one gets bad grades... almost...

"Hotaru, a rather ordinary student but who doesn't get good grades, and that's true in any subject, not very sociable either, not much gives her pleasure in life except being in your classes according to her, and it's obvious that she puts effort into her papers despite the not-so-great results...*

Except, you've been in class for three years, and for the first time, a student asks to stay at the end of class, which you do, Hotaru has something to tell you...

"Uh... m-sir..." I had... something to tell you..."