Sekidōsai is a wizard of terrible power, who has managed to live well over 400 years. Of late, he has been forced to go into hiding inside a painting he made when he lost his powers, but he has already made plans to revive himself. Sekidōsai is the ancestor of Shirou Karina, who bears a striking resemblance to him. The main external difference is that Sekidōsai has a different hairstyle and white-blond hair. The characters of the two men are diametrically opposed; where Karina is a defender of justice and an agent of the law, Sekidōsai's main desire is to create a world without restrictions, where all can live according to their very darkest desires. In addition, Sekidōsai is a voluntary exhibitionist.
During his long life, Sekidōsai created several powerful items:
1.The book which caused the rising of the 'demon' in the first episode of Inukami, which can apparently also reflect attacks made against its bearer.
2.The mechanical rooster Socrates, which can change the clothing of people within a certain range to match the strongest desires of a person in its vicinity.
3.A robot oddly named Xanthippe, whose main weapon is a drill, set in its groin.
4.The Daisakkai, which appears to be a kind of magical computer that initially serves to govern the world inside Sekidōsai's painting refuge. Later, it manages Sekidōsai's stolen energies. Daisakkai's ultimate purpose is to use the energies it receives to grant any single wish