The story takes place during a summer of continuous sunshine when water supply restrictions are issued in the city. Shunsaku Iwakiri works for the city's water department and his job is to visit homes and stores that are behind on their bills and either collect the money or shut off the water supply (water suspension enforcement). Shunsaku is separated from his wife and children, and his heart grows thirsty as he spends his days visiting poor households and being abhorred. One day, during a water shutoff, Shunsaku meets two young sisters who have been neglected. He sees them as his own children and offers them a helping hand.

University student Nohara has a boy friend Akito. Akito travels aboard with his friends leaving Nohara who doesn’t know how to swim. To surprise his boy friend, Nohara decides to attend swimming classes. Eventually, she has a secret affair with the guy in the swimming class…