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Unknown to Frank, his parents were being trained by powerful entities within the confines of the cosmos.
It seemed that their own consciousness were sent elsewhere… Which only made things even more confusing.
However, Frank didn't knew anything of this, and continued his daily life as usual…
Meanwhile, within Earth, a group of Onis was preparing themselves for a raid…
Within their secret hideout that was located outside of Tokyo, around the wilderness, they were preparing.
And the one leading them all was a girl that seemed to be in her late teens, with red-colored skin and two huge black horns over her forehead, showing off that she was a strong Oni with an almost pure bloodline!
Check "The Protagnist's Sister Is Actually the Strongest"!