Eri and her husband moved to a rented apartment in Tokyo after her husband started working at headquarters. Kanno, their kind neighbor, runs a shady investment business from home. Kanno, who took a liking to Eri at first sight, approaches Eri and tries to satisfy her desires. On the other hand, Koji, who is busy working at headquarters, is unaware that he is about to become genderless and the relationship between his beloved wife and Kanno.