Shunsaku Iwakiri works for the waterworks division at city hall. His main role is to visit homes and businesses that are behind on their bills and either collect payment or shut off their water. However, he is not happy with his job. In his personal life, he has separated from his wife Kazumi and their child. On a summer day and while performing his job, Shunsaku meets young sisters Keiko and Kumiko Koide, who have been left neglected at their home.