Korosensei vs. Saiki Kusuo ~Showdown in Iruma~

Korosensei vs. Saiki Kusuo ~Showdown in Iruma~ (殺せんせーvs斉木楠雄 ~入間市最終決戦~, Korosensei vs Saiki Kusuo ~Iruma-shi saishū kessen~) is an extra chapter of the Assassination Classroom manga. Originally published in the Autumn 2012 issue of the Jump NEXT! magazine, it is a crossover between Assassination Classroom and fellow Shōnen Jump manga series The Disaster of Kusuo Saiki (斉木楠雄のΨ難, Saiki Kusuo no Sainan).

The creators of both manga series (Yūsei Matsui and Shūichi Asō) hail from Iruma, such is the theme of the chapter.

Characters in order of appearance

 * 1) Kusuo Saiki
 * 2) Korosensei