Lost world (apocalypse)

The apocalypse was caused by a wildfire virus which spread worldwide in nearly 2 months.
Only about 1/16 of the global population is still among the living. The rest are all either dead or wandering around as the undead or zombies. (They act like the zombies is the walking dead)
The group has found each other about a week after the whole of New York was torn down by the undead. The group of seven has been sticking together ever since (3 months now)
They're still somewhere about 15km outside of New York. The group consists of 3 girls and 4 guys.
Aria (19), Ella (18), Louis (21), Aaron (24), Jason (24), Hannah (19) and Cole (23).
Before the apocalypse started and the group found together, there already existed friend groups among them.
Aria, Ella and Hannah were friends before, so were Aaron, Jason and Cole. Louis was the only one who was on his own when he found the group.
They're all gen-z which means they can hardly take anything actually seriously.