Ansatsu Kyoushitsu: Deai no Jikan

This episode of Assassination Classroom doesn't add much to the show apart from displaying the fact that Koro-sensei blows stories out of proportion, exaggerates to make himself look cool, but is more endearing than pretentious.

The episode depicts the two sides of how Koro-sensei and Karasuma met - Karasuma tells it how it is, Koro-sensei tell it how he wishes it was. Koro-sensei's narration is humourous and engaging, albeit unrealistic.

The animation is not as good as the actual show, but is still passable. There is no music to be noted especially. The two main voice actors (Jun Fukuyama and Sugita Tomokazu) perform well as they always ... do.

Assassination Classroom: Meeting Time is a cute 10 minute episode about how Koro-sensei met Karasuma that you can watch at any point before, during or after the main anime for a bit of extra content.

The story is very simple and it just concerns a first meeting between Koro-sensei and Karasuma, who are therefore the two main characters in this special. Their personalities are neat and reflective of the main anime.

The animation is quite good and it has the same animation style/quality as the main anime. The voice acting and sound are also good and the voice actors are all the same as in ... the main anime as well.

Overall this is a fun small special to watch for a bit of extra content.

I mean, this little ten minute episode was fine. It kind of shows how Koro-sensei and Karasuma met, but not really, which you'll understand once you watch it. Given that "not really" is a part of how accurate these two characters' first meeting was, I don't think it's sensible to call this a prequel, so if I were you, I wouldn't bother watching it. It's funny enough, but without the element of the kids in the classroom, it doesn't hit the same. This OVA, like the rest of Assassination Classroom, did the more serious/creepy tone very well. But if you came to Assassination Classroom for ... the humor, there isn't much of it in this OVA. I do think this episode would have been interesting had it been about the moment Koro-sensei stated his intent to teach the E class, but it's not actually necessary to see. So, I suppose this OVA just took the chance to tell a short story as a little precursor to Koro-sensei being introduced to his class. Like I said: it's fine. Nothing remarkable.