He comes from the cursed outer land. His entire body is jet black, he looks a being not from this world, he does not have a sense of taste or pain. He picks up Shiva, who was abandoned in the outer land, and starts spending time with her. He has knowledge of medicine. Shiva calls him "Teacher."
(Source: Totsukuni no Shoujo website)
![Totsukuni no Shoujo: [dear.] Bangai-hen](https://cdn.myanimelist.net/images/manga/2/273733.jpg?s=e3fbf85d285dcce1cebb7da6578afd2a)