Hisae Yabe, a 41-year-old housewife. Another late night waiting for her husband, lying alone in bed, aching with loneliness. Suddenly, she heard strange moaning sounds coming from her son's room next door. Peering through the sliding door's crack, she saw him masturbating. The sight made her fingers instinctively drift toward her own crotch. While waiting for her son to fall asleep, she quietly crept beside him.