Tomonori, who was living an ordinary school life, lost his mother to illness, but his father, Seiichi, soon remarried a beautiful woman, Hanae. She and her stepchild ``Marie'' were living a reasonably happy life together. One day, he learns that Seiichi has been having an affair with his current stepmother, Hanae, for many years. One night when the two of them are alone, Tomonori attacks his girlfriend's stepmother, Hanae. No, please stop, Tomonori-san... He tore her Hanae's nightgown from top to bottom, revealing her Hanae's bewitching flesh. Her feelings for her beautiful mother-in-law became distorted as a result, and her days of revenge began.