Shoichi Yamaguchi has a second wife named Tomoko. Tomoko is an unusually lewd woman who wants to have sex with him every night, but Shoichi has not been able to satisfy her for the past year. This is because the company is not doing well and he is exhausted from working hard every day. One day, Shoichi witnesses Tomoko masturbating. Shoichi feels guilty as a husband, but then an idea flashes in his mind. It is the idea of having his wife sleep with another man.