This is the story of the farewell and coexistence between humans and beings that surpass human intelligence. A world where most of society is managed by humanoid robots called hIE. One day, a 17-year-old boy, Endo Shinjin, met a humanoid robot, Racia, and concluded a master-servant contract with it. "That object" that looks exactly like a human is one of the five humanoid robots "unprecedented products of humanity" that surpass human intelligence, born from an ultra-high-performance AI with world-shaking performance. The five machines each have their own meaning, and they fight to gain each other's performance. The adults who can only watch this battle, and the boys who approach this existence and try to establish a new relationship. They seek the choice to the future and the answer to the relationship between humans and objects. What is the connection between over-evolved machines and the human world? In this era of over-convenience, what is important and what is necessary? The newcomer seeks the choice to the future and the answer to the relationship between humans and objects through his encounter with the humanoid robot Racia, which is far superior to humans.