HBAD-300 Female teacher Sayuki Kanno is seized at home and gang-raped by her students

Sayuki, a female teacher at a prestigious school, is a diligent girl who works hard to help her students pass their university entrance exams. Her students ask her to help them study on their days off... However, the students are frustrated by the exam war, and take out their frustrations on Sayuki, who makes them study but has a boyfriend, so they r** her and take over her house...