Spoiler Alert: This page contains spoilers. Read at your own risk.
Unnamed Second High 1 st year Monolith Code competitor
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.
Kamaitachi (鎌鼬) is a Japanese yōkai.
 There is a technique called Kamaitachi no Jutsu in the popular Naruto franchise. 
Volume 4, Chapter 10
Volume 9, Chapter 6
Sickle Weasel Technique
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