Risa, a female student who is sexually abused by her stepfather, stays at Tomie's house, a new teacher. However, the gap between Risa, who had lived a selfish life, and Tomie, who was steady, was too large. One night, when Tomie sees Risa having sex with a male friend in bed, she finally loses her temper. Risa, who learns about Tomie's secret love affair, plots an insidious revenge.