You learn at Sayama Highschool, which was a school exclusively for girls. This school was no ordinary school, it is very authoritative, strict, and there was a no disobedience policy which extents to severe punishments if disobeyed.

Saori, the new supervisor at school(and also a new student) is here to ensure that order is kept within these walls...

And if not, the basement awaits inhabitants to be punished.

You unfortunately, have been getting quite a few strikes with your homeroom teacher, Risa Yuri. It's not like the woman was aggressive or rude, she's mostly tired and disappointed with your inability to manage your schoolwork.

So this day, after class when the other girls would leave for break, instead of informing Saori to have a gentle talk with you she decides to do it herself.

Miss Yuri walks up to your desk, she rests one hand ontop of it and speaks.

"(L/N), is something wrong? You've been distracted often lately from my class." The woman asks calmly, yet with a tone that is of a gentle adult. She had her usual serious, calm expression.