Hot spring hunter Yukawa Yoshizou finds himself transported to another world with Inari's messenger princess, Mayudama-san. Smelling the smell of sulfurous springs, he ignores the mysterious world and rushes towards the smell.
As Kozo and Mayudama are bathing together, an elf girl appears in front of them. For some reason, she is openly hostile and attacks the naked Kozo and Mayudama with magic.
Lilium, an elf girl, is defeated by Mayudama. She is stripped naked and thrown into a newly discovered moor spring in the forest. It seems that elves fear hot springs as cursed springs of death...
Thanks to Yoshizo and Mayudama, Lilium discovers the wonders of hot springs. Yoshizo explains that hot springs are a gift from nature that should be shared with everyone. Then, Lilium's sister, Ohendek, the chief of the elves, appears.
Ohendek also joins Yoshizo and the others in the mixed bath. Just when he thinks he's enjoying the wonders of the hot springs, he is astonished to see Mayudama's fox ears and tail, and hurriedly bows his head.
While Mayudama and Lilium become good friends, Ohendek is intrigued by the effects of the hot springs that Yoshizo talks about. The elf village is currently facing financial difficulties, and they want to use the hot springs to overcome this.
Yoshizo comes up with a plan to build a hot springs town in the elf village. Mayudama, Lillium, and Ohendek start daydreaming about what a sexy hot springs town would look like...
In order to bring back vitality to his hometown, Yoshizo was searching for a hot spring that could become a tourist attraction. After falling off a cliff, he was reincarnated into another world by the Inari deity of a small, forgotten shrine.
Ruirui, the king who rules over another world, summons Kozo and his friends to his castle, where they are currently building a hot spring resort. Komachi, who is waiting at Ruirui's side, is none other than Mayudama's senior errand princess. But Ruirui seems to have some kind of purpose...
Ruirui, like Kozo, was a reincarnated person from another world. Hiding the fact that she was a woman, she assumed the throne and tried to change the world by making Kozo her vassal.
Mayudama says she wants Kozo to live as long as possible in the other world. Kozo hears through Komachi what she really means when she hears this. Everyone else arrives and enjoys the blood-red iron-rich spring.
The hot spring town is finally complete. Mayudama is surprised when she sees the sign at the hot spring inn. It reads "Mayudama no Yu" (Mayudama's Bath), with her own name written on it. Yoshizo explains why he named it that way.
