The story is about this boy and his brother. While out doing something, he got killed and a girl turned him to an undead. As an undead, he steals life around him, endangering his brother making him leave to another world/dimension. To live, he has to suck blood from his creator, the warlock girl. In this place he gets accepted to a top class magician/warlock school. He tries to find a teacher to help him control his undead power thing. I didnt get to read more than that. Can someone please tell me the name of this manga.
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