Episode 5

Assembly Time is the fifth episode of the Assassination Classroom anime series. The episode first aired on February 13, 2015.

Overview
Class 3-E student Manami Okuda specializes in poison making and has tried to assassinate Korosensei by making him drink her poisons. She fails so Korosensei decides to help Okuda create a poison that can kill him, but...

Difference Between the Manga

 * The beginning of the episode shows Isogai and Kataoka helping Korosensei take all the chemistry to the classroom and Maehara, Okajima, and Mimura trying to stab him while he sets up. None of this is present in the manga.
 * Unlike the anime, the manga never elaborated on Class E's trip down their mountain to get to the main building for the assembly.