Ever since he was born, Kantarou has had the 6th sense to see demons, and has become friends with them. One day a demon told him about an ogre-eating tengu, and ever since then Kantarou has been in search of it, and one day on a ghost busting case, finds him. He then names the tengu Haruka, and in naming him forces the tengu to be his slave. (anidb)