Apocalypse Greg, Vol 4, 5

In "Apocalypse Greg—(Light Novel Vol 4, 5)," reluctant hero Greg Michaels tracks a mysterious figure known as the "Cleanser" through the Arizona desert, where he encounters non-System survivors in unexpected places like the Phoenix Zoo. His journey takes him to a fortified Las Vegas, where androids hunt both humans and zombies, leading him to discover a dark secret beneath the Black Tower—a portal to the zombie realm. Armed with a trusty sword and a talking android head, Greg plunges into battle against the Lord of the Depths, confronting the ultimate challenge for humanity's fate.