The girl without a heartbeat

This is a story of farewell and coexistence between human beings and beings beyond human intelligence. A world where most of society is managed by humanoid robots called hIE. The 17-year-old boy, Rookie Endo, met a humanoid robot, Lecia, one day, and formed a master-slave contract with it. "That object", which looks exactly like a human, was born from ultra-high-performance AI with world-shaking performance. It is one of the five humanoid robots that surpass human intelligence and are "products that have not yet arrived at humankind". Each of the five machines has its own meaning, and they fight to gain the performance of the other. The adults can only watch this battle, and the teenagers are approaching this existence and trying to establish new relationships. They seek choices to the future and answers to the relationship between humans and objects. What is the connection between over-evolved machinery and the human world? In this age of excessive convenience, what is important and what is necessary? Through the encounter with the humanoid robot Lecia, which is far superior to humans, newcomers seek the choice to the future and the answer to the relationship between humans and objects.