An imaginary background similar to the Spring and Autumn Period and the Warring States Period.
The most important vassal states in the world are: Qingguo, Lihai, Hyotei, Shiboji, Yamabuki, Higa, Fudoho, and Rokkaku. There are also some other small countries. But the story in this article mainly takes place between the most powerful Qing Kingdom, Li Hai and Hyoudi.
From Nanako's perspective, the story of Echizen Ryoma, a young man from Seigoku who has the destiny of being the emperor, is told.