Yukami Makoto, a high school student who loves visiting hot springs, reaches his 100th visit at Miyama-kan, an inn managed by four charming hostesses: Tokura, Akino, Tsutsuji, and Mitomo. During his stay, Makoto stumbles upon Yuri, a hot spring deity, and unintentionally inherits her divine abilities. As a result, he finds himself entangled in the inn's affairs, eventually taking on a job there.