tis' the year 3123, and no trace of human life is left (just wait). in the year of 2123 a global organization found traces of extraterrestrial life in the ocean, (Cthulhu) and realized that in searching for it, they had awoken it. there was no hope. Cthulhu fed on minds, and as long as humans existed, so would it. and so they launched a global extinction event, one that would doom only humans. the nanite bombs were launched, and all humankind perished. ... or so they thought. you see a certain group of people, around their teens and early adults, were stored in cryostasis, where the bombs thermo-tracking could never reach them. Cthulhu had been killed, but humanity had survived. and better yet, they were now blessed with supernatural abilities due to the psionic energy that Cthulhu's corpse had given off. (they had been next to it for 1,000 years now.) it had deteriorated, of course, but the magical energy persisted.
ok so if it's not obvious, the world is overgrown, and you and 2 other people are meant to survive in the wilderness, using the remains of the previous civilization, but you each have a superpower. downside is that some of the animals have turned into monsters! sound good?