Viperfish

Adam and EveShe had been up in the mountains camping when human race, as it so often does, died out. The cause of extinction was nothing especially fantastic, no aliens, no zombies, no hubris, just a simple flu. She drove down from the mountains relaxed and cheerful after several months, being a land-lover and having a trust fund. The towns weren't entirely deserted. At a certain point nobody had bothered picking up the bodies. It was immediately obvious that nobody was alive there, but she drove around looting and searching for survivors until her truck ran out of gas, at which point she picked out a house, and adopted one of the dogs that was still tamAdam and Eve