BLUE SEASON Temptation Fruit (1997)

A history club member commits suicide by jumping off the school building. Hazuki is curious about the mysterious message, so she consults her father, a detective. She infiltrates the club and begins investigating her. The granddaughter of the powerful Hatsune holds the key to the incident. Hazuki is whipped by Hatsune and lured out by her homeroom teacher, Junko, who indulges in her pleasure. Hazuki is then raped and abducted by Hatsune's men. Hazuki had begun to touch the core, but the tragedy and humiliation had only just begun.