Phantom Seer, Volume 1: The Boy with Psychic Powers (Phantom Seer #1-7)

Iori Katanagi is a shaman who’s not very enthusiastic about his job. One day he receives an order from his sister that he can’t refuse - investigate the phantoms that are haunting his classmate Riku Aibetsu. However, the case doesn’t turn out to be so simple when Iori discovers a connection between himself and Riku’s strange power of attracting phantoms.