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onigawara yuutarou is your average high school kid, a bit on the quiet, kind-hearted side. one day, he walks through an arcane ritual and ends up summoning a demon, slayer, who will grant him 3 wishes. horrified by slayer’s violence, yuutarou wishes for slayer to stop using his demon powers, turning him into a human. now slayer’s stuck with yuutarou in a perfect personality mismatch, and to top things off, if one of them gets hurt, so does the other.