An ultra-advanced AI surpasses human intelligence, creating entities far beyond human comprehension from advanced materials that are incompatible with current technology. In a boy-meets-girl scenario, 17-year-old Arato Endo encounters an artificial being called Lacia in the form of a black coffin-shaped device. What purpose were these artificial beings created for? Amid concerns about coexisting with such entities and humans, a teenager makes an important decision.
A normal life takes an unexpected turn for Arato, a second-year high school s...