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"The Cult of the Archdemon Beelzebub has been spreading their influence across the Kingdom recently, and they were involved into this scheme. They used their Demonic Magic Tools to make it seem as if you were using your power incorrectly, and they were the ones that used brainwashing magic to convince you to use the souls of people, or even their bodies for your experiments. I've discovered this after relentlessly interrogating one of them. My friend, you're not the monster you think you are!"
Check "The Protagnist's Sister Is Actually the Strongest"!