A Remix Heart (リミックスハート Rimikkusu Hāto) is a unification of a human and a grimoire. Mai Hazuki is the only known Remix Heart, as she is a human vessel of the Nameless Grimoire, and, for a time, the Intermediary Grimoire.

A Remix Heart is required to smelt the Red Grimoire, which was researched by Sypher Alvar.

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