The cure to the apocalypse

Girl with the cure to the apocalypse. There's something in the air which wiped out most of the population. There were few survivors and it's set 5 months since it's happened and she makes her way to her only left family member that she knows of: her cousin. She meets a lot of people on the way; good and bad but in her world there is no evil or no good anymore

Slightly inspired by the last of us