When a mysterious, invincible, tentacled alien destroys 70% of the moon, he issues a bizarre ultimatum to Earth's governments: he will destroy the planet in exactly one year unless a specific class of junior high students can assassinate him first. Enter Class 3-E of Kunugigaoka Junior High School, a group of academic misfits and outcasts relegated to a dilapidated building isolated in the mountains. Their new homeroom teacher is none other than the world-ending creature himself, whom they affectionately dub "Koro-sensei" (the unkillable teacher). Despite his apocalyptic threats, Koro-sensei proves to be an exceptionally dedicated, compassionate, and highly effective educator. He not only teaches standard academic subjects but also trains his students in the art of assassination—helping them discover their hidden talents, build self-confidence, and overcome their personal demons along the way. As the students of Class 3-E attempt increasingly creative and desperate methods to eliminate their surprisingly supportive target for a massive government bounty, they must also navigate the intense academic hierarchy of their elite school and face off against professional assassins. Assassination Classroom masterfully blends absurd action-comedy with a heartfelt coming-of-age drama, exploring themes of unconventional pedagogy, societal discrimination, and the profound impact of genuine mentorship.
When a mysterious, tentacled creature destroys 70% of the moon, he threatens to do the same to Earth in exactly one year. In a bizarre agreement with the government, the creature becomes the homeroom teacher for Class 3-E, a group of academic misfits at Kunugigaoka Junior High School. Dubbed "Koro-sensei," he offers his students a massive 10 billion yen bounty if they can successfully assassinate him before the end of the school year. Armed with specialized government-issued weapons, the students must balance their regular studies with intense assassination training. However, they soon discover that the incredibly fast—moving at Mach 20—and virtually unkillable Koro-sensei is also the most dedicated and supportive teacher they have ever had. As they attempt to kill him, he helps them overcome personal struggles, face rival assassins, and challenge the school's harsh discrimination.

The ostracized students of Class 3-E at Kunugigaoka Junior High are assigned an impossible government mission: assassinate their superhuman tentacled teacher, Koro-sensei, before he destroys Earth.

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