[Machine Translation] A hundred years in the future. A world where most of society is left to humanoid robots called hIEs. Super advanced AI that surpasses the wisdom of mankind has appeared, and materials that far surpass human technology (products never before seen by mankind) have begun to be created. Lacia has a black coffin-like device. Arato Endo, a 17-year-old boy, meets Lacia. Arato is confronted with a human-like "thing" that has evolved in a way that humans are unable to handle. He is bewildered, suspicious, tossed about, and forced to make a choice. To believe or not to believe? A boy meets girl between "human" and "thing". Why were they born? Their existence and the meaning of human existence are questioned. And then, a 17-year-old boy makes a decision.