Yokaipedia (JFF)

After making wishes at a local shrine, Itsuki, Taichi and Sonny are visited by a ghost-like sprite during the night, who tells them about a mysterious Ghost Book that can grant any wish their hearts desire. But when the boys visit a second-hand bookstore in search of the book, chaos ensue as they are transported to an alternate universe inhabited by monsters! Not far behind is their schoolteacher Hayama, who`s been dragged into the mayhem. The group soon realises they have a mission: they must capture the monsters in the Ghost Book before time runs out.