It's a universe where science and magic coexist. Rayotte Steinberg battles creatures as a lone wolf "tactical sorcerist." They used to be humans, but they turned into monsters after abusing a prohibited force known as "magic." "Mold," the straight jacket that keeps him human, is what he wears. The "staff," a mystical wand that blasts everything, is what he holds in his hand. If he uses magic, he advances one step closer to becoming a monster. He will be murdered if he does not comply. Among the arduous trials, he will be confronted with a prior sin.