Yune had lived all his life confined in an orphanage, only going out at the end every month like clockworks, but he had always felt happy, surrounded by people he loved. So, it was all the more bitter when they betrayed him without a second thought after having been chosen by the marking phenomenon.

With a unique mark having been bestowed upon him, and being send to an academy to train his powers, Yune quickly realized the orphanage might not have been as ordinary as he thought.

But then again, the world also isn't like how it used to be anymore.

With six portals leading to other worlds having appeared on earth a hundred years ago, humanity had been fighting against otherworldly creatures from invading earth and is now even venturing into other worlds themselves to proclaim them ours.

In this time of catastrophe, where our world is in danger, humanity is now more united than ever, or is it?