The Day of Swinging

Sadao and his wife Yuka are employees of Mitaro. One day, the boss Mitaro asks Sadao to have a relationship with his wife to give him an excuse for divorce. Sadao wants to refuse but is forced to accept because Yuka is in urgent need of money. Afterwards, he received the reward and gave it to his wife, only to discover that it was all a conspiracy between Mitaro and Yuka...