This is like Blue Exorcist but with firefighters instead of priests.
I mean, there are nuns, and a lot of religious imagery, but it’s mostly about the firefighters. And when I say firefighters, I mean that literally, because it is an anime and they couldn’t possibly be normal, that’d be boring. They got superpowers, is what I’m saying. It’s cool. A little trope-y and stereotypical at times, and there is the obligatory fan service, but it’s still pretty fun.
Anyway, if you like anime like Blue Exorcist, you’ll probably like Fire Force too. Check it out, if you’re interested.