In a world where superpowered individuals, known as Ultra-Sapiens, exist, the clandestine Hunter-Killer program is tasked with monitoring and controlling these beings. The story follows Ellis, a young man who discovers that he is a living catalog of Ultra-Sapien abilities. As he becomes entangled in the covert operations of the Hunter-Killer organization, Ellis must navigate a complex web of secrets and power struggles that could determine the fate of humanity.