Keisuke, despite divorcing his wife Mizukawa a few years ago, still has some feelings for his ex-wife. He occasionally visits and supports her. Mizukawa is now living with another man - a rugged-faced man who particularly enjoys... physical intimacy.
One day, Keisuke visited Mizukawa and accidentally saw her being "abused" by her new husband. Although they are divorced, he still feels a bit jealous seeing such a scene...