I kind of expected this from the title being "365-nichi no jikan", but it really was simply a review of what happened over the course of the single year they spent with Koro-sensei. This OVA has little to no extra scenes of what happens afterward. If anything, it only has a minimum interaction between Nagisa and Karma reminiscing about the "old days". I think I would have enjoyed this if I didn't finish the entire series in 2 days, but it's good nonetheless. It was kinda dumb for me, personally, because while they are thinking and talking about what happened with Koro-sensei, as if it was wayyyyin the past, I just watched it yesterday man lol