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Spoiler Alert: This page contains spoilers. Read at your own risk. |
Gatekeeper (ゲートキーパー) is a Magic Sequence that's constructed in the Root while going through the Gate located between the subconsciousness and consciousness. The Gate is exposed in the Idea and Gatekeeper scrambles all Magic Sequences coming out of the Gate. Unless unlocked, victim magician can't use magic. [1]
Shiba Tatsuya developed Gatekeeper to neutralize the magic of magicians. [1] Shiba Miyuki made Jasmine Williams and James Jeffrey Johnson believe that Gatekeeper is a "secret technique" of the Yotsuba Family to deflect attention away from Tatsuya, but in fact it's actually his "secret technique". [1]
After confirming Tatsuya's acceptance, Yotsuba Maya asked Tsukuba Family to make efforts to improve Gatekeeper, thus as to allow others to use it. [2] It is believed that a person with adequate predisposition to Mental Interference Magic can use Gatekeeper. However, Tatsuya is able to use this magic due to his unique ability to monitor other people's Gate. [1]