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More importantly, I saw the anime looking for zombie characters but got that premise thrown out the window for something completely different that got covered up by idol girls singing in spite of reason, logic, legality, and initially choosing to feature zombies at first anyway.

Nah, dude, the premise wasnt thrown out, it just went way over your head from the start. The premise from the first minute was about a girl watching an idol and going out to tryout for the group. You could also read the synopsis to understand the show isnt what you were looking for

Charlotte, Noragami and Durarara maybe