Characters wake up, in an unfamiliar room and with a tattoo on the back of their hands. Was that there before? They can't remember. They can't remember much of anything--aside from their powers and race, of course. Something so intrinsic couldn't be forgotten so easily.
But everything else, they'll have to earn back, side by side with those who have the same tattoo. For reasons unknown, they've been sorted into teams. With these teams, they'll have mysterious summons to answer, calling them to play "games" with the promise of their memories on the line, and, eventually, a miracle.
But as their memories return, they'll find who they were in conflict with who they are now: those powers, that form, are they really yours? Or are, somehow, these returned memories the false ones? That may be...this place, it feels like home.