The Fujima and Sasayama families live in the same apartment building. On the surface, they are on good terms, but wives Nozomi and Yumi are acutely aware of each other's stunning beauty and voluptuous figures. One day, Nozomi catches her husband Atsushi having sex with Yumi. Shocked, Nozomi is further stunned when Yumi proposes a wife-swapping arrangement, which Nozomi, in her confusion, accepts. The two women heat up as they fiercely compete to steal each other's husbands!
