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Our protagonist Caam(?) is a man from Earth that was reincarnated into this world as a demon. In order to survive, he spared no effort in avoiding the sparks of battle and without noticing it, he became strong himself. Then, one day a demon that is stronger than himself suddenly appeared in front of his eyes. The demon said「You seem quite strong, aren’t you? Don’t you think someone that strong should become a Demon Lord?」. He tried to negotiate but, there was no right to refuse.
