Ryoko healed Tatsuya's body, tired from studying, in the bath every time because she wanted to pass her only son, Tatsuya. One day, the bath in my house broke without warning. Ryoko is surprised that the gas shop who came to repair was Tatsuya's classmate Nakajima, but when she saw Nakajima who was completely grown up and independent, Ryoko changed her mind that studying was not the only thing. Mother and child bathing together again that night. However, Tatsuya was sensitive to the fact that Ryoko's appearance was different from usual.
