Twenty years ago, the human race from the earth transferred into another world as amusements for higher beings. They forced humanity to play their game with everything at stake – life, pride, and their bond.

This world is a place where humans bare their fang to each other, a place barren of moral compass, a place where strength reigns supreme. Human atrocity, depravity, and viciousness appeared with nobody stopping them. However, against all the odds, humanity wasn't walking to their demise. They reached armistices, with each other and other races.

Right now, an orphan spends his day protecting his orphanage while often listening to his elder stories about a beautiful blue planet called earth – a place that so contrasts with this one. Even so, it's just an old tale about a hometown of the past generation. For him, the orphanage is his hometown, his life was hectic but also blissful with all his siblings caring to each other, until that day – the first day he met her – everything changes.