"Eriko" is an ordinary housewife who lives peacefully with her husband, daughter, and son-in-law Hiroaki. Her calm daily life is Eriko's treasure. One day, Eriko has an affair with a young man at her part-time job, and Hiroaki witnesses it. Hiroaki, who was stimulated by her sadistic heart by seeing Eriko begging her to keep her secret, grabbed Eriko's huge breasts. The two were drowning in forbidden pleasure.
