Let's say that IS takes place in a military camp of some manner. Instead of a school emblem, it's a military emblem. Hanya can be some kind of military head, as opposed to a headmaster. The students are soldiers. Maya is still a reporter. Etc. etc. etc...
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I'm not sure what's more amazing. The fact that you completely missed the point of Persona 2's story, the sheer silliness in your example, or the fact that you just turned Persona 2 into what is essentially Attack on Titan.....