"My daughter-in-law will become a meat urinal for kids..." Tatsuhiko spent many years persuading his childhood friend Nao, but it was a marriage with the condition that sex would not be forced. One day, when two of Tatsuhiko's nephews come to stay, the two clever people immediately discover the relationship between Tatsuhiko and Yuna, and conspire with the nephews to make a plan to sleep with Nao.
