When a mother falls to a son Natsumi Watanabe

Natsumi Watanabe is a mother who raises her son Tsushi alone after her divorce. She gets involved in a romantic affair with her colleague's friend Tanaka, but her son develops incestuous feelings towards her. As the story unfolds, Natsumi finds herself caught between her loyalty to her son and her desire for Tanaka. However, it becomes clear that Tsushi's feelings for his mother go beyond a normal parent-child relationship, leading to a taboo and forbidden incest scenario where the son ultimately claims his mother as his own, engaging in explicit acts including creampie and oral sex.