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Koro Sensei’s extraordinary speed and regenerative abilities pose significant challenges for the assassins. As days pass, they concoct various plans to eliminate their alien instructor. It soon becomes clear that Koro Sensei is not only a knowledgeable teacher but also a surprisingly supportive mentor, creating a complex relationship as students oscillate between admiration and lethal intention.

One standout character, Karma Akabane, later enters the scene. Despite his bullying tendencies, Karma possesses exceptional skills and is hell-bent on taking down Koro Sensei, leading to intense confrontation sequences that are both humorous and suspenseful.

The Introduction of Ritsu and Etone