There are approximately 10,000 sauna facilities nationwide. Who would have thought that in this age of sauna wars, an ordinary office lady like me would end up running a public bath sauna?!

Kawazu Sakura is an office lady with no enthusiasm or motivation, but also no courage to change jobs. One day after working overtime, she happens to enter a public bath sauna where she meets her cool coworker Somei Yoshino. The two of them never really talked, but Somei, who had wanted a sauna friend, taught Kawazu how to enjoy saunas. Obsessed with the charm of saunas, Kawazu and Somei become friends and go on sauna tours together. Then, Kawazu's grandmother, who runs the public bath alone, falls ill...!?