Comprehensive Guide For Assassination Classroom Content
Because it's pretty hard to find a straight up list of it all. Please note that whilst I believe this is accurate, I was not involved in the fandom whilst the series was active and so could reasonably miss something.
Assassination Classroom manga as serialised in Shounen Jump. If you buy the physical volumes, there's a bit of additional content between chapters, most notably introductory character profiles.
Assassination Classroom anime (some count seasons 1 and 2 as separate entities)
Assassination Classroom Meeting Time - an animated short featuring Korosensei and Karasuma's first meeting.
Assassination Classroom Extra Curricular Lessons - adaptations of a couple of manga chapters that weren't in the show itself. I'll just link a playlist here. Fun fact this is where Nagisa gets hit by a chair (lowkey he deserved it)
365 Days Movie. This isn't 'canon' as it's an anime original thing. There's no official English release that I know of. Honestly the movie is mostly a series recap, and only features Karma and Nagisa in new scenes. It's only really worth watching if you especially ship them as there's only maybe 10 minutes of actual content (and most of that is just montage, you can get the gist with this)
Roll Call Book - this was published mid manga run. It's mostly just a bunch of bonus content particularly character based. No official English translation exists, but snippets are easy enough to find online.
Graduation Album - as the name implies, it accompanies the end of the manga. About half of it is an art book, but there's extra character information especially about their post graduation lives. Crucially it includes a few manga shorts which extend past the actual canon ending.
Korotan A, B, C, and D plus Korosuu. They're mostly just Assassination Classroom themed text books (Seriously. My actual university book store sold them.) Korotans are for English vocabulary, Korosuu is for maths. Notably each book also contains a light novel (sometimes these are just referred to as 'the light novels'). It is debatable how canon these are as Matsui didn't write them, but he was involved through illustrating and overseeing the writing. Korotan D is especially debated because it's post canon content set when 3E are 18, but there's a small 'it was all a dream' implication right at the end of the book. Personally speaking I take them as full canon.
The live action movies (part one and two). They change a lot of plot so I place them more in the spin off area. Easily skippable.
Korosensei Quest Manga (otherwise known as Koro Q) - a spin off gag manga set in a fantasy/video game inspired universe. This is not canon (unfortunately) and as far as I understand Matsui isn't involved in it. There's an implication of the idea it's Fuwa's own manga creation. Overall there are four volumes but there's no official English version (though fan scans aren't hard to find).
Korosensei Quest Anime - lightly based on the Koro Q manga. This is only a short 10 episode series though, and was complete long before the original, as such only the first few episodes are actual adaptations and it starts doing its own thing. All voice cast return so that's neat.
The OVA - basically an early adaptation of the Kyoto arc. Link here. It was released in 2013 so predates the actual anime, and a lot of the voice cast are different.
White day shorts featuring Karma, Maehara, and Nagisa - posted on official website as an otome game parody for promotion. Included because they're voice acted.
The 3DS games. They're region locked as far as I understand, and there's no translation of them. You can find it dumped if you know what you're doing with emulators, I've only played a few minutes of it myself.
The app game - no longer available. It was a gatcha tie in game featuring a variety of character illustrations.
Various merch lines and related illustrations. There are far too many to list and new ones still come out sometimes.
As I said, I hope I covered everything but there's a good possibility something slipped my mind.
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