Mobile Fortress in the Frozen Apocalypse

In my past life, an icy apocalypse descended upon the Earth, and some people mutated into zombies. I survived the extreme weather using the coal I won at the company's annual party, but my jealous colleague ultimately caused my death. When I go back in time to the night of the party, I choose an RV instead and turn it into a mobile fortress. As luck would have it, I awaken an RV system. Determined to survive, I venture into a frozen world where new dangers are closing in.