I'm a librarian who loves anime, manga, and reading a wide variety of genres.
This is Attack on Titan if everyone was regular junior high students, sort of. The Titans are still there, but they're ordinary students and teachers too. So far the humor doesn't really work for me, but the author has an excellent understanding of the characters. Eren is insanely obsessed with the Titans (which in this series basically means he's a huge racist), and Mikasa is still propping him up with her awesomeness and general scariness. Armin's grandpa isn't too far off, considering Mikasa just threatened him.