Natural disasters struck, monsters ran rampant, and the world fell into famine and disaster.

Humans set ranks for them and use living lives to gain the rules of killing.

They have scarlet tongues and red light in their eyes, and they just want to eat all humans.

It's dangerous outside and I just want to hide in a safe house.

Lin Yu wants to create an absolutely safe area for himself.

Until one day, Lin Yu wanted to go out for a walk, but he found that the world was not so dangerous anymore...