Something of this mood. Singing comfort songs whilst the snowstorm or whatever is in the snowstorm could kill them.
I can't recommend this book enough.
If you read manga check out I Am a Hero. It's a zombie apocalypse, but it happens very gradually, and the protagonist and his coworkers maintain their 9-to-5 job as things gradually get worse.
>>23361908thought I was on /mu/ for a sec when I saw this