• Book Name: The Devil's Key & Girl's Raison d'être Manga
• Alternative(s): Akuma no Kagi to Shoujo no Raison d'etre; The Devil's Key & Girl's Raison d'être
• Genre(s): Action Fantasy Shounen Supernatural
• Author(s): UGUISU Kagura
• Status: Ongoing Download Manga
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Summary: One day, Natsuto found a girl near his house and it turns out she's a Holy Girl that is in a mission to eradicate the demons that escape from the Chaos Realms and as well as find the Key that can summon demons.