The protagonist is suspended from school for a crime he was innocent of due to some manipulation from the school.
It's not a severe punishment, since the protagonist was a delinquent to begin with, but Kotomi, a teacher who regrets not standing up for him, wants to make amends.
A dark fire of indecency ignited in the protagonist's heart when he heard.

Older teachers always had a charm that schoolgirls don't have.
He has a complex about his female teachers and a desire to bring them to their knees.
Seeing the perfect opportunity to get his wish, the main character takes advantage of Kotomi's weakness to give her lewd orders...
This is the beginning of the drama of training teachers and painting them white.