Incidentally, this chapter also may have been something of an inspiration for the manga Zom 100: Bucket List of the Dead, which also opens with the protagonist breaking out of a haze, finding that his entire home city is being consumed by the undead, climbing his way to the city below, and seeing the corpse (well, the zombified corpse, anyway) of a woman he already had a crush on, and which features a copy of it and the Zombie Survival Guide sitting on a shelf. The key differences are that Bucket List is a) complete gore-and-titties schlock with no pretensions to the contrary, b) has surprisingly more thought put into its weird zombie-fighting world (the protagonist finding a sharkskin suit is treated as making him essentially invincible), and c) has its most important message be "Japanese work culture sucks ass" and its most contentious message be "small towns are just nicer than big cities", as opposed to "we have become soft from our high-tech militaries and democratic free-press societies" and "apartheid-era policies will save us all by culling the weak."
Also, there is a character who runs around fighting zombies with samurai weapons, including a naginata and full battle armor. She is, in fact, a German weeb.