Fisherman Yoshihisa comes home every night craving his wife Hisako's body, while their son secretly watches and feels an intense desire for his mother. One day, unable to contain himself any longer, the son approaches Hisako while his father is passed out drunk. Initially hesitant, Hisako gradually grows aroused by the forbidden act with her own son, succumbing to overwhelming lust. As family bonds and moral boundaries blur, a shocking turn of events unfolds.