After earth was invaded by aliens, notorious billionaire scientist Adam Krim isolated his family in his luxurious lab inside Mount Ontake. He slowly lost his mind to his creation, a human-robot hybrid. Designed for war-extraterrestrials were not fathomed at the time but the machine is capable of killing anything, and everything. His son Bellamy is tasked with the difficult job of waking, teaching, and taming the Ex Machina named Gwen. As he attempts to train the cyborg for her purpose Bellamy begins to understand his father, bringing up past traumas not yet fully explored. While Gwen tests her abilities, killing the vicious Mantodea plaguing earth, Bellamy is forced to test himself. A player in her game, he tries to win but acknowledges his strategy is futile. Bound by something unseen, the two fall for each other, risking the world's safety. Bellamy's team expects productivity, they demand a solution to the ongoing battle against the violent aliens, yet he can't control the machine his father made. She has a mind of her own.