Who is the bad guy in Aru Zombie Shoujo no Sainan?
While most anime follow the good vs bad script Aru Zonbi Shōjo no Sainan is not one of them. We have two sides: the zombies, and the zombie adversaries.  Neither can be described as good as both commit immoral acts. For example, the zombies kill innocents (the caretaker in the first place), while the zombie adversaries constantly betray each other.

Nevertheless, the story of Aru Zonbi Shōjo no Sainan can be understood as a clash of values. In Euphrosyne Studions worldview, loyalty plays a major role. This is demonstrated by her punishment of Masahiro Abe and her venturous rescue attempts to save Alma.

The college kids on the other hand are betrayed by Sayaka. Who is betrayed by Takanashi. Who is betrayed by Mako. And I nearly forgot Abe tried to sell his group out too.