While father Koichi is away, mother Nozomi and son Atsushi begin a secret affair. However, Nozomi is tormented by guilt and a sense of taboo, wanting to end the relationship. Watching her struggle, Atsushi's desire grows stronger each day—whenever his father's gaze is elsewhere, he feels an overwhelming urge to possess his mother's body. As the tension escalates, the story delves deeper into how Nozomi will confront this forbidden situation.