Monsters & Robots

There are several things that could cause an apocalypse - a worldwide war, plague, zombies even. No one expects mutated monsters AND a robot uprising to both team up and end everything.
The two took out over 90% of the world population in the span of two years.
The first to arrive were the mutated monsters. A few mammal species caught a highly contagious disease that mutated them and caused them to grow much larger. They didn't take too kindly to us humans trying to quarantine them and kill them so they fought back. That was the first year.
Second year is when the robots emerged, originally manufactured for the public as home assistants, but reprogrammed as pest control for the mutated creatures. However, there was a glitch in the programming and they ended up turning on their creators. That's when everyone gave up and just tried to survive.
It's been six years now. Asher, a stubborn loner, decides to go off on his own. He leaves the safety of the boarded up shopping mall he and a small colony of people were using as a safe haven.
What he didn't hope for was to meet a girl out in the wild of the apocalypse, let alone be saved by her.
And Emma, she certainly wasn't expecting to find such an oblivious idiot waving around a gun like a dinner bell.