Raikou Minamoto

Handsome young wealthy nobleman, main oponent of series. He can see demons and kill them. He is leader of the government's Demon Extermination Squad. He wants to make Kantarou cancel the name contract with Haruka so Haruka will get his memories back and become the "real" demon eating tengu he wishes to defeat. He hates that Kantarou was able to unseal the demon-eating tengu but he himself could not. He wields Minamoto's Legendary sword.
His allies are Watanabe and Ibaragi.