Ataru, a son, is Kokoro to be reunited with his mother's friend Iori , whom he has adored since childhood. When he meets her again after a long time, she has grown into a grown woman, and his secret love for her burns even stronger... Meanwhile, Iori, who has been feeling Kokoro due to misunderstandings with her husband, can't help but make love to Ataru. Unable to forget the pleasure they once experienced, the two indulge in secret pleasure. Ataru wants to continue their relationship, but Iori feels guilty about her affair with her friend's son...