ナイア

The woman proprietor of a rare bookshop who helps Kurou in his detective work. She has a bewitching aura and an alluring physical presence about her, but the depth of the mysteries swirling around her is a closely guarded secret - there's a certain something about her that no one has been able to discover... Her full name is Nyarlathotep (ナイアーラトテップ), an Evil and Outer God.

In Kishin Hishou, after the failure of Infinite Spiral, she managed a different scheme that involved with the son of Elder Gods. This time she is acting as the Game Keeper set up Game of Chaos across space and time for Daijuuji Kuzaku, with his opponent is Another Blood. By using Another Blood as the pawn and Demonbane Two-Sword as the vessel, Nyarlathotep capable of summoning the Mechanical Nightmare Deus Machina - Clockwork Phantom.