Character profile
Zero Kiryuu
錐生零Biography
Zero Kiryuu is Yuuki's childhood friend and fellow Guardian on the disciplinary committee. Born into a family of vampire hunters, he harbors a deep hatred of vampires and carries the gun Bloody Rose.
Story spoilers
Zero's family was murdered by Shizuka Hio. Zero was bitten during that attack and secretly became a vampire. Blood tablets do not work for him, so Yuuki's blood helps him retain control, and he is destined to become a Level E vampire eventually. He asks Yuuki to kill him with Bloody Rose if that happens.
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