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The Worst Villain is Actually a Cute Girl

In a future city intertwined with science, magic, and various races, a fearsome villain lives.
“How dare you try to use such a young child. Do you have no conscience?”
“It’s truly regrettable. To think that this girl could be the key to eradicating a den of evil.”
“You can rest easy now. We will definitely protect you.”
Sorry, but I’m actually that villain…
It seems like a serious misunderstanding.