Janus Abigail

Key Magic: Janus Abigail (鍵魔法 『』) is a Key Magic spell.

Description
With an opened grimoire, the user opens up a magical space capable of storing objects and stolen magic from Janus Baptism within. The user can freely open these magical space through doors which have their own respective keys.

Trivia

 * Janus is the Roman god of gateways and doors, among other things. He is also depicted as having two faces.