After being banished years earlier for war crimes, Leo Bleed has been called back to his home world, Core. He is one of many among the elite mercenaries that Core recruited for its military force. A force that is comprised of convicted criminals...but for what purpose?

Leo is certain that there is something deeper going on, and that one of his superiors, Iron Rose, is involved in the intrigue. Little does Leo know that he is the key to the mysterious "Project A1," an operation that will shake the foundations of Core itself. Will Leo figure out the truth in time to save his friends, and himself, from the hidden danger?