"My wife has become a sex slave for some brats..." Tatsuhiko has spent years wooing his childhood friend Nao, but the marriage was conditional on not forcing her to have sex with him. One day, Tatsuhiko's two nephews come to stay, and the two, with their keen intuition, immediately see through Tatsuhiko and Yuuna's relationship, and the nephews conspire to seduce Nao...