There is an invisible arena floating high in the sky that no one knows about.
All the defeats in life where you are wronged and have no time to defend will end up in an endless cycle.
The deceased is trapped in the regrets of the past. Who set the rules for this unsolvable reincarnation?
But the ordinary girl Kyoko can open the arena. She endured the misery of the situation, but was regarded as transparent by the world. Is this power a gift or a curse?
Fate has brought the four people together, but each of them seems to have a past they don't want to talk about.
Rewriting the established defeat time and time again, forcing the reincarnation to end.
But when countless regrets are ended, the ultimate truth hidden deep in the arena has just surfaced.
Purpose: To end the endless reincarnation of all sentient beings trapped in the past with the hands of mortals