Eri and his wife move to a rented apartment in Tokyo after their husbands work at the headquarters. Kanno, his kind neighbor, runs a shady investment business at home. Kanno, who fell in love with Eri at first sight, approaches Eri and tries to satisfy her lust. On the other hand, Koji, who is busy working at the headquarters, is unaware that he is about to become genderless and the relationship between his beloved wife and Kanno.