[DeepL Translation - needs review] Volume 1 Introduction: During his last summer vacation in high school, Ume Sasaki comes to help out at his great-grandmother's ryokan, Hanatakiya. On the night she arrives, she slips in the outdoor bath and falls into the tub. The person who pulls him up... is a mysterious girl named Fujino, who calls him "Nee-sama. Hanatakiya is the same as usual. But there is a strange heating apparatus using charcoal, and the season has changed from summer to winter. Cou...
