Suzuka, who married into her husband's family as a younger stepmother, hoped to be accepted as a mother figure by her stepson, who was closer to her age. However, he still saw her as just a child. One day, Suzuka decided to start dieting and encouraged her stepson to exercise with her, but he could only stare intently at her. Seeing his voluptuous stepmother up close, his inner fantasies began to grow. Eventually, those desires turned into action.