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It is the world where magic and science coexist. Rayotte Steinberg, a lone wolf "tactical sorcerist", fights against monsters. They used to be human beings, but they had overused forbidden power, "magic", to turn into monsters. What he wears is "mold", the straight jacket that keeps him being a human. What he holds on his hand is "staff", a magical wand that explodes everything. If he casts magic, he moves one step to be a monster. If he doesn't, he will be killed. Among the harsh battles, he will face a sin he had committed in the past. (Source: AnimeNfo)