Yukami Makoto is 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. Makoto ends up working at the inn.
| Actor | Role |
|---|---|
 Yuichi NakamuraMakoto Yukami (voice) | Makoto Yukami (voice) |
 Satomi SatoYuri Shirahane (voice) | Yuri Shirahane (voice) |
 Asuka OhgameTsutsuji Tounosawa (voice) | Tsutsuji Tounosawa (voice) |
 Kanae ItouMitomo Rokuya (voice) | Mitomo Rokuya (voice) |
 Hisako KanemotoAkino Mikogai (voice) | Akino Mikogai (voice) |
 Ai KayanoTokura Ushiki (voice) | Tokura Ushiki (voice) |