Kid are immune.
Adults are not.
A virus wiped most of the adults out, leaving confused, determined, and broken kids. Five of them meet, but they aren't what they say.
A liar, a killer, a sadist, a hero, and a villain.
Together despite their differences, find a common goal to find their lost families. But one is lying, one has killed, one has done unspeakable things, and two are out for each other's blood.
(a/n: this is just the very very rough draft, so it'll be really messy)