Monami is a young student teacher, full of a sense of justice and passionate about education. One night, on her way home from work, she helps a male student who is being bullied, and to her dismay, finds out that a senior teacher is involved in the bullying. Monami pursues the senior teacher, but he uses her sense of justice against her and exposes her weakness, devouring her voluptuous breasts and raping her in front of the bullied student. The senior teacher then calls the students over, and Monami's breasts and body are gang-raped, causing her sanity to break down...