Amaryoju is a spirit who is similar to an elephant in form. He chose Zakuro, Susukihotaru, Bonbori and Hozuki as representatives for the spirits because they are half-spirits who are neither human nor spirit.

Westernization, a time when humans and spirits coexist. <br><br>
The modernization of Japan has begun. The Ministry of Spirit Affairs is established to resolve mysterious incidents involving the nation&rsquo;s spirits. This ministry consists of representatives from both the human and spirit worlds. Zakuro, Susukihotaru, Bonbori, and Hozuki are all half-spirits 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! <br><br>
(Source: NIS America) 

Amaryouju