The Kazama and Sasayama families live in the same condominium. Although they are ostensibly close friends, their wives, Nozomi and Yumi, were conscious of their outstanding beauty and glamorous, plump body. One day, Nozomi sees her husband Atsushi and Yumi wandering around. When Yumi proposes a cuckold exchange as if to revenge Nozomi who is shocked, Nozomi from the upset accepts it. The two who heat up develop a fierce battle where they work hard and scramble for their husbands!