Aisle Nine, by Ian X. Cho

The day that multiple portals to hell opened up around the world, spewing out blood thirsty demons, everything changed.  While retail had always been hell, the opening of a gateway to Hades in Aisle Nine (homewares) of the Here For You discount store made working there even more challenging.  But some well-placed coupons and a detachment of soldiers with flame throwers kept footfall at acceptable levels.  For while there are a couple of "doomers" who have given up and live in constant despair, most people go about their business, shopping, and trying to collect points by passing a roadblock or witnessing a demon slaying.  After all, most people have their lives to live.

Jasper works at the Here For You.  Try as he might, he has no real memories of the past for Hell on Earth arrived.  There are people who seem to know him (like a trainee security guard named Kyle) and he discovered his job when he happened to walk into the store and got cornered by his manager.  However, he has the same recurring nightmare in which the world comes to an end.  And it's coming soon -- on Black Friday.  With some help from Kyle and a friendly pet demon, he plans to stop all of that, dodging crazy shoppers and bloodthirsty monsters (same thing?) and save the world.

Initially, the book is an absolutely hilarious and original farce that imagines what would happen if the end of the world came and no one cared so long as they could keep shopping.  The story loses its fun as the farce peters out about half way through and the plot turns serious (or as serious as it can, given the premise).  But while I loved the premise, I just couldn't get into the largely nonsensical story and weak characters.