Ghost Hound

Summary: 

    The series is set in the modest town of Suiten, located in a remote mountain region in the island of Kyūshū, and follows three boys who have each had traumatic encounters in their childhood and learn to transfer their souls into a parallel world known as the "Unseen World". The Unseen World is however undergoing a change, with its ghosts starting to appear in the real world, which is therefore also being subject to changes.