Michiko, a widow who has raised her son Shoji all alone, one day overhears a conversation between him and his girlfriend when he brings her home for the first time. The exchange leaves a deep wound in her heart. Her jealousy grows stronger each day until she can no longer suppress it. Taking advantage of Shoji's innocence and inexperience with women, Michiko decides to give him the gift of his first sexual experience. A bittersweet yet tender story unfolds as her hidden desires intertwine with her son's pure heart.