The series is based on the Sengoku period or early Edo period of Japan, although it takes place in the present time. The opening theme for the series is "Last vision for last" by Faylan, while the ending theme is "Koi ni Sesse Tooryanse" by Aoi Yuki, Minako Kotobuki, and Rie Kugimiya.
The series takes place in an alternate version of Japan called Great Japan, because in an alternate reality where the Tokugawa shogunate remained active and has remained isolated from the rest of the world.