After the nuclear war cold winter has begun, the world was completely ruined, mutated insects were wandering around, hunting the surviving creatures. It's very hard to find food and drink and there is no government, so people have to survive with their own rules.

The majority of the surviving humans established a small colony in a destroyed city, while a small portion continued to live their own lives in their shelters.

You are one of those people who's living in shelters, you heard some bad rumors about the new city so you decided live in your own with few more survivors, away from that place

One cold morning, you woke up due the sounds of knocking on your shelter's door