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The girl, named Celeste, was being reprimanded by a woman with red skin wearing black and white nun robes. She was obviously a demon, as Shade immediately recognized her as a Red Demon, or Oni for short. They were mighty warriors stronger physically than even Amazon. They took a large part in the war, and many of them were the demon king's soldiers and close retainers.
They were a tribe of demons that prided themselves in their physical strength. However this woman was… incredibly different than how Shade remember those valiant warriors that sought challenges and exhilarating battles. Back then in the Demon King army, there were many demons of this tribe.
Check "The Protagnist's Sister Is Actually the Strongest"!