Married for three years, with a quiet husband, Takeshi, and a baby. 3 Seiko is a housewife who lives a peaceful life with others. Takeshi's classmate and businessman Ken comes to visit. Seiko is Kokoro by Ken's active and attractive appearance, and through conversation with Ken, she rediscovers her inner womanhood. Seiko's casual clothes gradually become more flashy. A poor housewife falls more and more for a rich man - even though she knows it's wrong, she sneaks out of her house where her husband and children are waiting for her, and falls into the role of an unfaithful wife who has endless French kisses and creampies without contraception...