The chapter about zombie cycle, is about two childhood best friends in highschool trying to survive the zombie apocalypse. One of them is very unfazed by the zombies but the other is scared. The scared one protects the unfazed one which turns him into a zombie. They both end up becoming zombies after unfazed one says there's no point in living without him. Rescuer's think they are human because so
Alive and content.
Ezuke wa Yahan, Ano Heya de