Four lonely mothers-in-law rediscover their sexuality through forbidden encounters with their sons-in-law. Chisato comforts him after he reveals a vulnerable side, and her gentle embrace leaves him aroused. Reiko gives him a massage, notices his erection, and reaches out because she feels responsible. Asaka is accidentally seen naked in the shower, then catches him masturbating over it. Another mother-in-law is discovered masturbating; she resists his advance, but begins responding when he fingers her. Four hours of domestic infidelity starring Reiko Kobayakawa, Chisato Shoda, Kasumi Shimazaki, and Asaka Tomita.