Rio is living with Ken, her fiancé. Then a postcard arrives. It's an invitation to her high school reunion... She wants to see him. But she shouldn't see him, he's someone she can't forget. Seeking the image of her beloved ex-boyfriend, Rio attends the reunion—!? (Source: Kodansha, translated)

Nagase Nodoka is a young female architect who has a reputation for designing amazing onsen (bathhouses). She and her assistant, a cheerful, energetic girl nicknamed Mike, travel around Japan together. While they enjoy the natural hot springs and get to know the people at each locale, Nodoka designs beautiful baths to fit each of their clients' needs.