Wanting her only son, Tatsuya, who is a repeat college entrance exam repeater, to pass the exam, Ryoko would take every opportunity to soothe his tired body in the bath. One day, without warning, the bath at home broke down. Ryoko was surprised to see that the gas man who came to fix it was Nakajima, Tatsuya's classmate, but seeing how grown up and independent Nakajima was, Ryoko changed her mind and realized that studying isn't everything... That night, mother and son took a bath together again. However, Tatsuya was keenly aware that Ryoko was acting differently than usual...