Yukari and Yuuji have been married for several years. One day, when their sex life was feeling stale, Yuuji gets a call from a friend who had an affair and realizes that he has a cuckold fetish. Wanting to get someone else to cuckold Yukari, he comes up with the idea of secretly giving his wife an aphrodisiac. After drinking the aphrodisiac and going to a beauty salon, Yukari becomes aroused and ends up having a physical relationship with another man...