He was a slave for life, born without a name. One of many, and yet few, that allowed the majority to live comfortably at the cost of their well being. Despite these circumstances, his kindness and righteousness knew no bounds. Not once had he resented the Gods or blamed destiny for his circumstances. Not once had he lost sight of what he believed in, no matter the cost he had to pay to do so.

This was the man known by his peers as Mentor.

Yet, even the ideals of such a man had one day begun to crumble under a cruel reality.

An escape attempt ended in failure, resulting in a vicious punishment that led to the man's demise. He was finally able to welcome the sweet embrace of death, but fate was not done with him yet. Reincarnated into a different world, he was filled with hope for the future. Assuming it was his just reward and a chance for a new life, he set forth into the world, trying to reach towards a simple happiness, that could make him forget his past suffering.

Alas, he didn't know how whimsical fate could be.

As betrayal followed him with every step, he realized, time and time again, the shackles of his own destiny.

Until at last, as he was faced with the injustices of his two lives, his ideals and hopes were broken beyond repair. Unwilling to restrain the accumulated hatred within him any longer, he'd finally unleashed it upon the world, where none would be spared from his hate-fueled vengeance against the world.

Thus, if you dare follow Aien on his road of destruction, leave behind your morals, and witness the birth of a Demon.