Ansatsu Kyoushitsu: Deai no Jikan
English name: Assassination Classroom: Meeting Time
Genres: Action, Comedy
Type: Special, Episodes: 1
Aired: Nov 9, 2014
Studio: Lerche
Source: Manga
Rating: PG-13 - Teens 13 or older
Synopsis:
Koro-sensei reminisces about his first meeting with Karasuma, where they first butted heads and fought against each other, ultimately coming to respect one another. However, Karasuma eventually points out their actual meeting wasn't nearly as eventful.

(Source: ANN)