Koro-Sensei Q is a manga I love to recommend. A comedy spin-off of Assassnation Classroom! Same idea but this time it's set in JRPG-like world. Same characters as the original. Made for its fans, but don't

"We are Assassins. Our Target is: The Teacher!" -- Nagisa Shiota Assassination Classroom takes an idea that shouldn't work, and makes a memorable Manga/Anime out of it: A Dramedy about Middle