Both directed by Seiji Kishi. You will see a lot of similar comedic gags between the two series.
Group of misfit students who are in some special place or in special conditions. Both are comedies that try to be sentimental.
Both have teenagers wielding pistols, sniper rifles, and automatic weapons. Both have a very large cast of characters, almost all of which are students. The comedy style is, in my opinion, very close to that of Angel Beats. It isn't really trying to make you sad like Angel Beats does, but I really get the same feel off of both of them.
Both are about students and classrooms, in both the students try to get something done with plans (operations) and through action.
Both are set in a school
Both have a lot of comedy
Both can get you right in the kokoro (Well, AssClass's second season)
Both use a unique premise to liven up usually tropey school shenanigans, and both strike a good balance between comedic fun and emotionally stirring moments.
Both deal with the theme of students attempting to assassinate someone and have a low chance of succeeding.
Angel Beats! is a lot like Anatsu Kyoushitsu. They’re animes with teenagers determined to kill someone, at least in the beginning. They’re both set in a school setting and have the same kind of comedic style. At the end though, they are both heart-wrenching animes.
Defeat the superior. Assassination Classroom and Angel Beats presents students who fight against a superior force.
Assassination Classroom follows the eccentric students of Class 3-E in their mission to kill Koro-sensei before he destroys the world. Angel Beats having the same concept through the SSS tries to fight against god to get their revenge for their horrible lives before they died.
Both anime are great action-comedy in a school directed by Seiji Kishi.
-Both series start comedic but end up dramatic
-Both series have misfit students who all have a specialty
-Both series are in a school
Both shows are set in a High School like environment and have to do with assassinating someone (at least at first). They seem really funny and lighthearted in the first few episodes but get deeper after you get to know the characters. Also, the endings of both shows will bring you to tears or at least move you.
These have many similarities assassination trials by the students and making strategies are pretty much same.....!