On New Taiwan Island in the 22nd century, humans uploaded the consciousness of dying people to the quantum cloud through the "Torch Project", but accidentally created the first batch of bionic humans with emotions. Among them, the protagonist Zero is the first bionic experimental subject to awaken.
When the military launched the "Rain Tower" project in an attempt to permanently solidify the consciousness of all mankind, a war over the definition of the soul broke out in the heavy rain. The androids raised the flag to protect humans, but humans themselves became the cruelest hunters.
