A beautiful meteor shower brought an alien virus, which infected all living things on the earth. It not only caused some of the living things on the earth to mutate, but also led to the death of a large number of living things.
The previous human social order also declined and collapsed because of this. After that, the surviving humans established strongholds one by one and redeveloped a new social order based on strongholds.
Shou is a "pioneer" in one of the strongholds and makes a living by taking on tasks.
The reason is that the virus is a mutated "alien" (it is human-shaped, but different from humans, so it is alien)
HE
Purpose: Self-acceptance