When Minami Azusa and her stepson Chinatsu Akimoto are alone together, the lack of blood relation triggers an instinctive excitement in him. The stepmother, too, finds herself drawn to her stepson's youth, gradually perceiving him as a sexually attractive man. Their thoughts grow increasingly ambiguous, and their relationship deepens steadily. In the absence of her husband, Minami cannot help but stare at her stepson's youthful body, while Chinatsu finds himself unable to resist his stepmother's seduction. Between them, no barriers remain. Driven purely by instinct and overwhelming desire, their bond intensifies as they become beings who crave nothing but each other.