“My daughter-in-law has become a dumping ground for my child…” It took Tatsuhiko a long time to convince his childhood sweetheart, Nao, that the marriage was conditional on not forcing sex. One day, Tatsuhiko’s two nephews came to stay, and the two intuitive nephews immediately discovered the relationship between Tatsuhiko and Yuna, and plotted to get Nao to sleep with them.