Ichiko and Otoya, a couple in their thirties, get along well, but lacking pizzazz in their sex lives, they decide to see other people. But seeing her happy husband in love has stirred up Ichiko's desires. Is she irritated, jealous, or simply frustrated… ? On the other hand, Otoya's mistress Mitsuki insists on continuing their relationship, despite pangs of conscience. What does a couple need to keep their marriage going? An ambitious story of lies and truth in the institution we call marriage!