Ansatsu Kyoushitsu: Deai no Jikan
English title: Assassination Classroom: Meeting Time
Japanese title: 暗殺教室 episode:0 出会いの時間
Type: Special
Episodes: 1
Source: Manga
Genres: Action, Comedy
Studios: Lerche
Duration: 10 min
Rating: PG-13 - Teens 13 or older

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)