Westernization, a time when humans and spirits coexist-
The Modernization of Japan has begun. The Ministry of Spirit Affairs is established to resolve mysterious incidents involving the nation's spirits.
This ministry consists of representatives from both the human and spirit worlds.
Zakuro, Susukihotaru, Bonbori, and Hozuki are all half-spirits (a hybrid between human and spirit) who have been partnered with the second lieutenants Kei, Riken, and Ganryu.
These half-spirit girls and the male second lieutenants are all assigned to Spirit Affairs in an effort to join forces and carry out any tasks given to them!