Luna Sasashita is an overworked office worker whose greatest pleasure in life is visiting the sauna. One day, however, she accidentally wanders into something completely unexpected: a sauna in another world! Run by a colorful assortment of fantasy races, this otherworldly sauna offers experiences impossible back home, from löyly performed by a slime heat-wave master to a cold bath supplied by a sacred spring and open-air relaxation above the clouds. To Luna, it's nothing short of paradise.

Unfortunately, there's one major problem: nobody in this world seems to understand just how wonderful saunas are, and the establishment is struggling to stay in business. Worse still, Luna needs money to repair the device that can return her to her own world. Determined to protect the perfect place to “totonou” while earning her way home, Luna puts her passion for sauna culture to work helping rebuild the struggling establishment, introducing its unusual customers to the joys of heat, cold, relaxation, and the perfect post-sauna meal along the way.

A relaxing fantasy comedy about bringing the joys of Japanese sauna culture to another world!