Assassination Classroom — Story Arcs & Filler Guide
Episode ranges, plot summaries, and frequently asked questions for every major arc in Assassination Classroom. Updated 2026.
Filter by arc
Meet Koro-Sensei
Eps 1–8 · 8 epsWho is Koro-Sensei?
A mysterious, octopus-like super-powerful creature who destroyed 70% of the moon and threatens to destroy Earth within a year — while inexplicably becoming the beloved homeroom teacher of Class 3-E, the students tasked with assassinating him for a massive bounty.
Why can't the students kill Koro-Sensei easily?
Koro-Sensei moves at Mach 20 and can regenerate from nearly any damage, only vulnerable to special anti-Koro-Sensei weapons — while remaining a genuinely dedicated, caring teacher to his students, which complicates the class's resolve.
Rivals & Growth
Eps 9–22 · 14 epsWhat is the rivalry between Class 3-E and Class A?
Class 3-E is treated as the school's disgraced "End Class," made up of students the administration considers failures, while Class A represents the elite. Their exam rivalry becomes a recurring source of tension and growth for the 3-E students.
Kyoto Trip Arc
Eps 23–31 · 9 epsWhat happens on the Class 3-E Kyoto trip?
The class travels to Kyoto for a school trip that becomes complicated by a rival assassin, Takaoka, hired to interfere with their mission and target the students directly.
Final Assassination Arc
Eps 32–47 · 16 epsWhat is revealed about Koro-Sensei's past?
Koro-Sensei's true identity and tragic backstory — including his connection to a secretive government project and his relationship to the students' former teacher — is revealed in the final arc, reframing the entire series' emotional core.
Do the students kill Koro-Sensei at the end?
Yes. In an emotionally devastating final arc, Class 3-E carries out the assassination as promised, but on their own terms — as an act of love and closure rather than violence, fulfilling both the contract and Koro-Sensei's own wishes.