A new breed of humans have started to awaken to their evolution, experiencing a 'trigger' that hastened them to advance sooner than most normal humans.

They are called Accelerators, individuals who went through a physical or mental metamorphosis that separated them from the ordinary. They harbor special skills and unique abilities to use at will. Their numbers have slowly increased over the years. Those who were discovered were registered in the government and had their lives changed in the consequence; those who fear being found out remained hidden.

The ones who underwent the natural phase of acceleration, showing obvious signs of change together with newly acquired abilities are called ACCELS. Those with superior innate skills are VERIFIERS, possessing no special abilities nor physical transformation yet have highly developed senses that identify them from the norm.

The government has long known of their existence. There were those who wanted to use such abilities to their advantage; those who wished to discover its origin; those who were against such methods; and those who refuse to have anything to do with them.Â

The presence of accelerators in the world, albeit discreet, were viewed as a threat. Factions soon formed within the government, extending into chains of other groups with motives of their own -- pro and anti. One in particular concluded a research and put it into actions as security against accelerators was their excuse for conducting the tests

The ALTERS emerged, once regular humans who participated or were subjected in experiments that forced them to accelerate. The successful products, namely the survivors, came out with the same transformation as the Accels and with abilities of their own. However, the coerced transformation took its toll on their physical and mental state. Only the organization responsible for their change could provide the proper maintenance.

It was like releasing two tidal waves clashing when Alters, Accels and Verifiers clashed. To prevent further turmoil which can be considered they were accountable for, the government created an institution for Accelerators of all forms --- and possibly avert a warfare between these new classes of humans, and keep them from involving the normal ones.

In this new facility they are educated and trained to develop their skills and abilities, yet placing them on tenterhooks with each other, while keeping them form the public eye.

-The first chapter covers how Xenon and Ami met t in H.A.D.E.S