I'm a math teacher. Kanna is a school nurse and we work at the same school. Kanna was worried about the delinquents who would pull sick students out of the nurse's office and take over her bed to take a nap, so I scolded them instead. However, the delinquents took their anger out on Kanna and gang-raped her, cumming inside her. She ended up being trained by a pervert who wandered around the school in an indecent outfit...