OVA
Description
Misako is a young housewife who marries Yosuke Amamiya, becoming stepmother to his son Kazuhiko. She possesses brown eyes and black hair, typically styled in a ponytail, and often wears lipstick, presenting a conventional appearance.

Initially striving for a peaceful family life, Misako endures persistent sexual dissatisfaction stemming from her husband's work-related neglect and emotional distance. This frustration makes her vulnerable to anonymous phone calls from a stalker possessing intimate knowledge of her routine. The stalker escalates to sending unsolicited sex toys, exploiting her unmet desires.

Her stepson Kazuhiko, initially cold towards her, is revealed as the stalker. He manipulates events to discover her using the sent toys, then blackmails her into a physical relationship. Though initially resistant and guilt-ridden, Misako gradually abandons her moral reservations, developing a consuming obsession with Kazuhiko. Her actions shift from reluctant compliance to active pursuit of the relationship.

This dynamic intensifies when Misako discovers Kazuhiko engaged sexually with her younger sister, Emiko. Witnessing this triggers intense jealousy, leading Misako to devise plans to regain Kazuhiko's exclusive attention and reassert her primacy in his life. The sisterly bond between Misako and Emiko deteriorates into rivalry and antagonism.

Misako's psychological state deteriorates throughout the affair. She experiences conflict between societal taboos and her own escalating physical cravings, ultimately prioritizing her obsession over her marriage and family stability. She rejects her husband entirely, concluding Kazuhiko is her true emotional and physical necessity. This culminates in her being physically intimate with Kazuhiko when her husband unexpectedly returns home, creating a crisis point.

Regarding resolution, the manga depicts an epilogue scene featuring Misako and Kazuhiko together in wedding attire. An extended edition of the original video animation series includes additional footage suggesting a conclusion to their story.