After graduation, delinquent students, to express their gratitude to their usually stern female teacher, brutally gang-raped her. (Kirioka Satsuki, ROE-420)

In May, a kind and caring teacher, she had successfully guided all her students to graduation over her many years of teaching. This year, she was assigned a group of unruly students, but under her strict discipline, they all graduated. After seeing her students off with a smile of satisfaction, May sat alone in the empty classroom, reminiscing about the past. Suddenly, the classroom door was violently pushed open, and her former students stormed in. "Teacher, we wanted to thank you properly for taking care of us all these years..." Surrounded by them, May was about to suffer a gang rape, a revenge born of gratitude and hatred from these despicable students. The stern teacher was pinned down in the classroom by the students she had once disciplined, one by one brutally violated—this was their so-called graduation gift.