The story revolves around Yukami Makoto, a high school boy whose hobby is visiting hot springs. His 100th hot spring visit is at Miyama-kan, an inn run by four poster girls: Tokura, Akino, Tsutsuji and Mitomo. There, Makoto spies Yuri, a goddess of the hot springs, and unexpectedly usurps her powers...

Source: MyAnimeList