Kamaitachi is a magic spell of which little is known. It is an offensive spell mentioned only twice in the Light Novel. * First, it was mentioned during Nine Schools Competition/First Year in Tatsuya's second Monolith Code match, a first year student from Second High School used this magic. * Second, Tatsuya informed Erika after her fight with Angie Sirius while chasing the vampires (magicians possessed by Paranormal Parasite) incident that she was attacked with this spell mixed into a wind magic by Angie Sirius.