Season 1
22 episodes · Jan 9, 2015
A class of junior high "misfit" students who are tasked with assassinating their new teacher, an octopus-like creature nicknamed Koro-sensei, who destroyed the moon and threatens to destroy Earth in a year. The students have to learn to balance their assassination attempts with the lessons from Koro-sensei, who is surprisingly an excellent teacher, while the government offers a ¥10 billion reward for his head. Each episode often focuses on individual students, their growth, and their internal conflicts between wanting to kill their teacher and growing to care for him.
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S1E1Assassination Time
Jan 10, 201524mA creature who blasted the moon into a crescent shows up at Kunugigaoka Junior High School--and he's giving the students a year to assassinate him!
S1E2Baseball Time
Jan 17, 201524mThe reasoning behind the E Class's segregation is revealed. Nagisa tracks Koro Sensei's weak points in the hopes of using them to take him down.
S1E3Karma Time
Jan 31, 201524mThe brilliant, belligerent Karma Akabane, Nagisa's former classmate, joins 3-E and immediately jumps into the assassination mission with both feet.
S1E4Grown-Up Time
Feb 7, 201524mA new foreign-language teacher comes to 3-E with some major ulterior motives... among other things. Will she get any closer to killing Koro Sensei?
S1E5Assembly Time
Feb 14, 201524mBefore the torturous school assembly begins, Okuda attempts to poison Koro Sensei in an unexpected way... with unexpected results.
S1E6Test Time
Feb 21, 201524mTime for midterms! Koro Sensei gives his aspiring assassins an ultimatum as they battle a grueling test and the disdain of the rest of the school.
S1E7School Trip Time, First Period
Feb 28, 201524mThe students go on a school trip to Kyoto, where they must still keep assassination foremost in their minds. Kanzaki faces trouble from her past.
S1E8School Trip Time, Second Period
Mar 7, 201524mThe E Class gives a pro sniper plenty of chances to take down Koro Sensei, then try to make the most of what's left of their school trip to Kyoto.
S1E9Transfer Student Time
Mar 14, 201524mA new student joins the E Class with a singleminded focus on assassination that drives her classmates to distraction. Koro Sensei to the rescue!
S1E10L and R Time
Mar 21, 201524mIrina is greeted by her former master, retired assassin Lovro, who thinks she should give up as she has no chance of killing Koro-sensei.
S1E11Transfer Student Time, Second Period
Mar 28, 201524mClass 3-E prepare for the arrival of their second transfer student, who is allegedly more powerful than Ritsu.
S1E12Ball Game Tournament Time
Apr 11, 201524mA baseball tournament is to be held, in which Class 3-E are forced to play an exhibition match against the top players of the school's baseball club, which Sugino used to be a part of.
S1E13Talent Time
Apr 18, 201524mAs Karasuma briefly senses what appears to be a fearsome aura coming from Nagisa, Akira Takaoka, an aquaintance of Karasuma from the Ministry of Defense, is sent to Class 3-E to take over Karasuma's role as P.E. teacher.
S1E14Vision Time
Apr 25, 201524mKoro Sensei exposes a major weakness, and Terasaka interrupts a fun summer day out with an assassination attempt that goes a little too far.
S1E15End-of-Term Time
May 2, 201524mFor finals, Koro Sensei gives his class a new goal--with an irresistible reward. The E Class makes its own deal with the top-tier A Class's Big Five.
S1E16School's Out - First Term
May 9, 201524mAfter two days of exams, the results are in. Both the ace A Class and the end E Class must come to terms with the outcome--and so must Koro Sensei.
S1E17Island Time
May 16, 201524mThe E Class trains intently under a pro killer to prepare for their island assassination. Once there, they must make sure everything falls into place.
S1E18Action Time
May 23, 201524mThe summer assassination attempt is followed by a crisis affecting nearly half the E Class. Can the rest think and move fast enough to save them?
S1E19Pandemonium Time
May 30, 201524mThe E Class must put their lessons into practice as they tackle an intimidating hotel brimming with baddies--and all without Koro Sensei's help.
S1E20Karma Time, Second Period
Jun 6, 201524mKarma must use his head to get past a formidable foe. Nagisa goes undercover as the E Class continues to sneak its way to the hotel's top floor.
S1E21XX Time
Jun 13, 201524mThe students take on one last assassin opponent before meeting the shadowy figure who's holding the virus remedy hostage in exhange for Koro Sensei.
S1E22Nagisa Time
Jun 20, 201524mBefore Nagisa completely gives into his anger, Terasaka throws a stun-gun at him, urging him not to become a murderer and think about what's truly important.