Yamamoto and his wife have a good relationship and live a happy life. a plain couple who looks like they're everywhere... However, the night life was exactly "the master" and "the nephew". His wife, Miwako, felt love from her husband for jealous sex and thought that she could do anything for her husband. One day, Miwako received a sudden proposal from her husband. "I'd like you to try whether your love for me is real or not! Can you promise that I'll never have a squid if I had sex with a man other than me?"