Hitomi lost her husband a year ago. Taichi, worried about his mother who has not spoken much since then, witnesses Hitomi masturbating in the bathroom one day. Taichi thinks his mother must be lonely, so that night he approaches her as she sleeps and starts to fondle her, but Hitomi rejects him. After that, the two take a bath together, but Taichi gets an erection. Seeing this, Hitomi reaches for Taichi's crotch...