Mark receives a phone call from Anna's lover, Heinrich, telling him that Anna is with him. The next day, Mark meets Bob's teacher, Helen; she inexplicably looks identical to Anna but with green eyes. Mark visits and fights Heinrich, who beats him. Mark then beats Anna at home, after which she flees. The next morning, they have another hysterical argument during which they both cut themselves with an electric knife, Anna on the throat and Mark on the arm.
Despite being fully aware that he is their ultimate target, Koro-sensei is able to bond with Class 3-E, who in turn regard him as their indispensable teacher. When asked why he took the job, he says it is done to fulfill a promise made to someone. Throughout the school term, Class 3-E welcomes three additional students: Karma Akabane, who has recently come out of his suspension due to protecting a former Class 3-E pupil from being bullied by Class 3-A students; "Ritsu", an AI-box displaying the form of a girl; and Itona Horibe, the also-tentacled self-proclaimed "blood brother" of Koro-sensei who is carried away from the school by his cloaked guardian after losing a match against the latter. At one time, Karasuma's position as P.E. teacher is briefly replaced by his rival, Akira Takaoka, a drill instructor-esque individual. Karasuma is then challenged by Takaoka to send a student to attack him with a tap of the knife. Karasuma then sends out Nagisa who successfully plants the tip of the knife on Takaoka, thereby expelling him from the school.
Before the finals, Koro-sensei promises that the top scorers of the five academic subjects (Chemistry, English, Home Economics, Japanese, and Maths) will be awarded chance to cut his rubber-like tentacles, which will greatly slow him. When the results for the finals are out, a total of six students are able to top the finals, including three students who got the first rank on the Home Economics test, thus granting the six the chance to cut Koro-sensei's tentacles. The students plan the killing during the summer holiday, where they reminisce about their kind past teacher, Aguri Yukimura. Eventually, Class 3-E manages to bind Koro-Sensei thanks to Nagisa's observation of his weakness: water. However, Koro-sensei transforms into a ball to avoid being killed. Suddenly, the class is interrupted by a vengeful Takaoka, who poisons several students. He agrees to trade the antidotes for Koro-sensei.
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