Episode 5

Assembly Time (集会の時間) 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 toxin that can kill him, but...

Summary
Manami Okuda attempts to poison Korosensei but to no effect. She has poor communication skills, but she has a passion for chemistry. Because of this, Korosensei offers to help Manami make an effective poison. However, it turns out to be a tonic that transforms him into a speedier liquid form, teaching Manami to improve her communication skills so she can successfully deceive him someday. Later, Class 3-E is forced to travel from their old campus and head to the main campus to endure a school assembly. The students from other classes become envious due to Class 3-E having Karasuma and Irina as cool teachers.

Korosensei shows his support by disguising himself as a scholar, providing extra copies of handouts previously not given to Class 3-E. Afterwards, Nagisa manages to use his experiences in Class 3-E to handle himself against Nobuta Tanaka and Chōsuke Takada, two bullies from the main campus.

Difference Between the Manga

 * The beginning of the episode shows Isogai and Kataoka helping Korosensei take all the chemistry equipment 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 the mountain to get to the main building for the assembly.