Tsukimichi: Moonlit Fantasy Vol. 15 (Light Novel)

In Vol. 15, the Kuzunoha Company heads for a small territory in the demon kingdom named Keruneon. But upon seeing the miserable conditions of the country with its cold winters, heavy snowfall, and chronic labor shortage, Makoto is inspired by the idea of using hot springs as a countermeasure. Meanwhile, excited at the news that Makoto has dug up a hot spring, the Japan-obsessed Tomoe sets out to develop a major hot spring resort that will surprise even Makoto!
Notice: This book is written in Japanese.