Riho, an adult niece role-player, reunites with her uncle after ten years, now sporting a soft, voluptuous body and G-cup breasts. She comes to Tokyo for university entrance exams and stays with him, remaining as innocent and affectionate as ever while unknowingly pressing her grown body against him. She even joins him in the bath. With his self-control at its limit, their playful intimacy becomes slippery raw penetration; her wet hair, soaked uniform, soft breasts, and plump pussy drive him wild until he loses himself in sex and creampies her repeatedly.