History Manga / AssassinationClassroom

Two [=OVAs=] premiered during the 2013 and 2014 Jump Special Anime Festa tours: the 2013 OVA adapts the Kyoto field trip arc, while the 2014 OVA, titled ''Episode 0: Encounter Time''[[note]]unofficial English translation[[/note]] (Episode:0 出会いの時間 ''Deai no Jikan''), details how Koro-sensei and Karasuma first met. Afterwards, a two hour TV anime adaptation produced by Creator/{{Lerche}} premiered on January 9, 2015, with its second season debuting a year later on January 7, 2016. The ''Episode 0'' OVA was included as bonus content for the anime's first home video release. Creator/{{Funimation}} has picked up the rights to stream and dub the anime. The show made its American television premiere on Creator/AdultSwim's Creator/{{Toonami}} block on August 29, 2020. In Australia, Creator/SBS2 is airing the anime.

Two [=OVAs=] premiered during the 2013 and 2014 Jump Special Anime Festa tours: the 2013 OVA adapts the Kyoto field trip arc, while the 2014 OVA, titled ''Episode 0: Encounter Time''[[note]]unofficial English translation[[/note]] (Episode:0 出会いの時間 ''Deai no Jikan''), details how Koro-sensei and Karasuma first met. Afterwards, a two cour TV anime adaptation produced by Creator/{{Lerche}} premiered on January 9, 2015, with its second season debuting a year later on January 7, 2016. The ''Episode 0'' OVA was included as bonus content for the anime's first home video release. Creator/{{Funimation}} has picked up the rights to stream and dub the anime. The show made its American television premiere on Creator/AdultSwim's Creator/{{Toonami}} block on August 29, 2020. In Australia, Creator/SBS2 is airing the anime.

* {{Doorstopper}}: What Koro-sensei produces every time he comes up with a "[[GreatBigBookOfEverything guidebook]]" for class excursions. One octopod's guide is another man's industrialized carbon-capture method--with indices, cross-references, info-panels, bullet points and plot-significance.

** Chapter 140 of the manga reveals that Koro-sensei had sewn his clothes out of hemp plant fiber, [[spoiler:shortly after he escaped from Yanagisawa's lab and assumed his current form]]. The manga release of Chapter 140 includes a little ending illustration showing Koro-sensei itching all over his body, because he wears clothes made out of freshly sewn plant fiber.

* CerebusRetcon: Nagisa's androgynous appearance is at first played for laughs, often leading to him being cross-dressed. [[spoiler:Then we find out that his controlling AbusiveMom forces him to dress as a girl. While she does not stop, Nakamura, who often teases Nagisa and forces him into girl's clothes, is horrified and apologises.]]

[[caption-width-right:350:"We are [[ProfessionalKiller assassins]]; our target is our teacher."]]

* AdaptationalHairstyleChange: [[spoiler:Aguri Yukimura]] has short hair in the manga and the anime, but in the live-action movies she has long hair that goes over her shoulders.

** The live action movie duology had to massively streamline the manga's story in order to fit into a combined 4 hours of runtime; thus, numerous story arcs and characters such as Asano Jr., the Five Virtuosos, Smog, Grip, Gastro, Nagisa's mother, and the Reaper are omitted. Chairman Asano is also DemotedToExtra in the first movie, and is absent in the second movie altogether.

** CreepyCentipedes for the Chairman and his son.
** Koro-sensei with octopods; this one is invoked by Koro-sensei himself.

* ArcSymbol: The permanent crescent moon, symbolizing Koro-sensei, often serving as a reminder of just how powerful he is. [[spoiler:It is revealed much later that Koro-sensei had appropriated the crescent moon for himself as he took the blame for the moon's destruction, sewing the symbol on his tie. Additionally, as Nagisa notes in the epilogue, after Koro-sensei's death, the crescent moon slowly coalesces back into a sphere thanks to gravity; in essence, the crescent moon "died" with him.]]

** Kaede Kayano hates [[BuxomIsBetter big boobs]] because she is insecure about [[ACupAngst her own size]], and will often upset whenever big boobs are brought into her attention.

* ClearTheirName: One arc has Koro-sensei framed for underwear theft and other especially perverted acts, causing most of his students' trust in him to dwindle. However, Karma catches on that while Koro-sensei ''is'' a pervert, he would never step this low, as losing his students' trust would be worse to him than dying. So Karma forms a small team (Himself, Kayano, Nagisa, Fuwa and Terasaka) to find the real culprit and clear Koro-sensei's name.

* CruelMercy: It's unclear whether Nagisa realizes this, but his finishing move against [[spoiler: Takaoka]] counts as this. Even as it's happening, he knows that he'll never get Nagisa's smile out of his nightmares. It may have been kinder to just kill him.
--->'''Nagisa''': [sincerely, with a genuine smile] [[spoiler: Takaoka-sensei]], thank you very much.

** [[spoiler:"The tentacles asked [me], 'What would you like to be?' [I] answered..."]] becomes one later in the series. It's used by every character that [[spoiler: acquired tentacles in summation of their flashbacks explaining what led to them seeking the power they provide.]]
** The "we are assassins and our target is our sensei" internal speech shows up a lot as well, especially early on. [[spoiler: And gets a heartbreaking reprise in the final.]]
* ArmorPiercingSlap: Delivered the Koro-Sensei way after [[spoiler: the students get too confident in themselves, decide to disobey Karasuma's orders by trying out their new free-running skills in a civilian area, and end up injuring a bystander in the process.]]

* BatmanGambit: [[spoiler: Azusa]] pulls this on Korosensei in the extra chapters to lure him into an assassination. [[spoiler: After discovering that she has an inoperable brain tumor, she learns about Korosensei from the four assassins who frequent her pub. She then purposefully signs a contract with loan sharks that ends up getting her kidnapped, forcing the assassins and Korosensei to rescue her. After the rescue, she planned to blow up the building to either kill Korosensei and leave the money to her daughter; or, if Korosensei didn't show up, to kill the loan sharks, erase her debt, and protect her daughter, while leaving her daughter with a considerable amount of money from the life insurance she took out on herself.]]

** The doctor ([[spoiler:Shiro]]) who [[spoiler:turned an extremely skilled but still human assassin into the superhuman Koro-sensei]] looks rather attractive at first; then he starts referring to his secret human test subject as a disposable guinea pig ("he doesn't have a family registry so it doesn't matter if he dies"), smashes a vial of ''something'' on an assistant's head, and strikes his other assistant/slave/[[spoiler: wife via arranged pity-marriage]] on the head with a computer tablet ''repeatedly''. By the time [[spoiler: the (first/original) God of Death]] KO's him through a solid plexiglass barrier his good looks have gone a bit off.

* BigBad: Shiro is the most recurrent antagonist Koro-Sensei and his students face over the course of the series, earning this spot by default. Then it's solidified when [[spoiler: it's revealed that he's really Yanagisawa, the MadScientist who transformed Koro-Sensei from a human into what he now is, making him responsible for the whole series in the first place. Then he and the God of Death, who he makes his [[TheDragon Dragon]], jointly serve as the FinalBoss at the series' climax.]]
* TheBigDamnKiss: [[spoiler: Nagisa pulls a [[ChekhovsGag 15-hit combo French kiss]] on Kayano in order to knock her out so that Koro-sensei can remove her tentacles.]]

* BlamingTheVictim: Kunugigaoka divides students into A, B, C, D and E classes based on grades, with the Class E students having the lowest grades and being placed in a separate campus away from the main school with sub-par resources. No concessions are made for students no matter their reasons for having poor grades, meaning many of the Class E students are perfectly intelligent and capable, yet are essentially punished for circumstances out of their control.

** During Takebayashi's mini arc it is mentioned that a student once broke some stuff in the headmaster's office and was sent to Class E immediately, which Takebayashi uses for his own advantage. Many chapters later it is revealed that the student mentioned in the story was [[spoiler: Kayano]].

* CerebusRetcon: Nagisa's androgynous appearance is at first played for laughs, often leading to him being cross-dressed. [[spoiler: Then we find out that his controlling AbusiveMom forces him to dress as a girl. While she does not stop, Nakamura, who often teases Nagisa and forces him into girl's clothes, is horrified and apologises.]]

* TarotMotifs: Seen in Lovro's explanation of the Secret Killing Technique. The Chariot represents a powerful opponent, The Fool for the actual technique, and The Moon for an assassin.

* ArcSymbol: The crescent moon on Koro-sensei's tie. It's often used as a reminder of just how powerful Koro-sensei is.

* AwardBaitSong: The second ending theme of Season 2, "Mata Kimi ni Aeru no Hi" ("Until the Day I See You Again"), as well as the insert song for Season 2 Episode 4, "Tabidachi no Uta" ("Journeying Song").

** Try and kill Koro-sensei? No problem. Harm innocent bystanders, especially his students? Very, very bad idea. [[spoiler:Shiro and "Number Two" found out the hard way after they nearly killed Kayano when she tried to protect him. He doesn't even turn his usual shade of black -- he turns ''blinding pure white''.]]
** Class 3-E has some:
*** When Irina calls the class the "E class jerkwads" and tells them that studying would be meaningless, she gets pelted with school supplies by the whole class.
*** Mess with one of them, and the whole class (and their teachers) will come after you. Such moments include ganging up against two students who bullied Maehara and [[spoiler:working together to defeat 3-A in the pole match, in order to stop Asano Jr. from telling the school that Isogai has been breaking the school rules by having a part-time job]].

** Don't mess with Nagisa's friends.
*** Specifically, don't [[spoiler:deliberately push this button by rubbing in the fact that you're trying to brutally kill off all of his friends]]. The one {{Troll}} who managed to successfully piss Nagisa off wound up traumatized from it for the rest of his life.
*** When [[spoiler:the God of Death knocks out Yoshida, Muramatsu, and Kimura, Nagisa finally enters into his "assassin mode" when it appears that the God of Death had broken some of Kayano's ribs]].
** Kaede Kayano hates [[BuxomIsBetter big boobs]], and it's usually PlayedForLaughs. Though there are certain exceptions.

* SolemnEndingTheme: "Mata Kimi ni Aeru no Hi" (Until the Day I See You Again), the second ending theme for Season 2.

* SpaghettiKiss: Invoked in Chapter 74; during the courage test, Koro-sensei dangles a Pocky stick as a setup for Maehara and Okano to do the Pocky game.

* WeirdMoon: It is a permanent crescent with overly long horns, thanks to Koro-sensei blowing up 70% of it in the beginning. It's even one of the moons on the trope image!

* AdaptedOut: Several chapters that provide characterization for the supporting classmates were left out of the anime adaptation.
** Maehara's [[ADayInTheLimelight limelight]] chapters (23 and 24) that establishes him as the class casanova seem to have been removed from the anime entirely. One can only imagine it had something to do with the whole "[[spoiler:poisoning your schoolmates]]" thing.
** Sousuke's [[ADayInTheLimelight limelight]] chapter (37), which shows off his artistry, also got skipped.
** Meg's [[ADayInTheLimelight limelight]] chapters (44 and 45) that deals with an issue of a school student abusing Meg's generosity also didn't make the cut.

* BadPowersGoodPeople: Koro-sensei has been teaching the Class-E how to benefit their lives with the mindset of the assassin.

** A cultural one, for Brazil. [[spoiler:[[UsefulNotes/TheWorldCup 7 to 1]]]]. Triggered when Koro-sensei is vacationing there, thinking up math problems.

* BlandNameProduct: In Chapter 2, the K.Y. Times for the New York Times, and the Turkies for the New York Yankees. The Pocky seen throughout the series is known as Pooky. There's also 5 Up soda, Jac Danas whiskey, and ([[SubvertedTrope rather unblandly named]]) Void brand computers.

** In the English dub, when the class [[spoiler:sings HappyBirthdayToYou to Koro-sensei]] right before the climax, Terasaka wonders if they even have the legal rights to do it.

** In the ''Episode 0'' OVA, Karasuma attempts to assassinate Koro-sensei by shooting at him, but the latter manages to avoid the bullets thanks to his speed, and even catches one of them with his bare tentacles.

* FictionalSport: The students of Class 3-E play "assassination badminton" in PE class, which is actually more like volleyball in almost every way. The main differences are that they can only touch the ball with the blade of a knife, and they use a tennis net instead of a badminton or volleyball net.

* FunWithAcronyms: In the anime, the anti-Sensei weapons are labeled "S.A.A.U.S.O." which stands for "Special Arms Against Unidentified Slimy Octopus". In Japanese, it can mean "come now, a lie".

* TheGuardsMustBeCrazy: Those two guards on the top floor of the hotel in the Island arc are trained agents, yet both of them immediately left their spot to chase after a kid just because he insulted them. Not to mention they got outrun by a kid (a kid trained in assassination and the fastest runner, but still...).

* HijackedByGanon: [[spoiler: [[DrillSergeantNasty Takaoka]] in the Island arc.]]

* SweetTooth: Tentacled beings such as Koro-sensei, Itona, and [[spoiler:Kayano]] are all shown to have preferences towards sweets. Extra info in the manga's volume releases justifies this by stating that someone with tentacles will require a ton of energy to maintain them, thus they'll naturally be drawn towards foods high in carbs and sugar. Additionally, the Reaper is sometimes shown eating a chocolate bar, [[spoiler:and in a twist of fate, he becomes a tentacled being in the finale himself]].

* EverybodyKnewAlready: After his first match with Itona, Koro-sensei decides he has no choice but to reveal a shocking truth about himself: he is actually an artificially created creature. No one in the class is surprised since Koro-sensei already said he isn't an alien and an artificial being was the only explanation left.

* MinimalisticCoverArt: The manga volume cover artworks usually consist of nothing more than a few solid colors and Koro-sensei's face. Special mention goes to the 5th volume cover, which shows Koro-sensei's [[http://fyeahassassinationclassroom.tumblr.com/post/83714736434/heliohapt-assassination-classroom-volumes-1-9 poker face]]: blank white with the ._. emote.

** Chapter 83 is a comedy chapter about Koro-Sensei being framed as a PantyThief. [[spoiler:Then it turns out to be a set-up for Shiro and Itona making another elaborate and dramatic attempt to kill Kuro-Sensai, which ends with Shiro committing what for many readers was a MoralEventHorizon moment when he callously dismisses Itona and leaves him to die.]]

* TheReasonYouSuckSpeech: Weaponized by Class 3-E in the island arc, when they force Koro-Sensai to watch a secret-camera video compilation of all his sleazier, more dishonest and more embarrassing activities to soften him up.

* MinimalisticCoverArt: The manga volume cover art is usually nothing more than a few solid colors and Koro-sensei's face. Special mention goes to the 5th volume cover, which shows Koro-sensei's [[http://fyeahassassinationclassroom.tumblr.com/post/83714736434/heliohapt-assassination-classroom-volumes-1-9 poker face]]: blank white with the ._. emote.

* SinisterGeometry: The monsters representing the questions in the school's math finals are fittingly designed with this in mind. The die probability question is imagined as a giant vaguely [=d8-shaped=] crystal with hexagonal shields circling it, and the last question is an enormous cubical structure with a bust of Art/VenusDeMilo on top, descending from above.

** At the end of the Assassination Island arc, [[spoiler:the class celebrates Nagisa defeating Takaoka, but were concerned that he didn't leave enough antidote to treat the sick students. Then, they're interrupted by the three hitmen he had hired, which said that they don't need no more antidote. Turns out they were telling the truth; Smog put a milder toxin which will dissipate by itself in a few hours, instead of the one Takaoka asks him to use.]]

* FictionalSport: The students play "assassination badminton" in PE class, which is actually more like volleyball in almost every way. The main differences are that they can only touch the ball with the blade of a knife, and they use a tennis net instead of a badminton or volleyball net.

** On the other hand, [[spoiler: we find out that Koro-sensei used to be an assassin, no less than the previous "God of Death", and thus he's responsible both for countless victims killed for a price and for training the ''current'' "God of Death", who eventually turns against him. It's only after being transformed and losing his loved one that he [[HeelFaceTurn takes a turn for the better.]]]]

%%* ProductionThrowback / MythologyGag / ProductionForeshadowing?: In Chapter 178, one of Koro-sensei's advices to Fuwa that he wrote in her personalized guidebook is for her to write a spinoff story where he's a demon king. This alludes to the spinoff ''Manga/KoroSenseiQuest'', which debuted a year prior to the chapter's release.

The series counts with an ongoing, non-canonical SpinOff manga entitled ''Manga/KoroSenseiQuest''. Basically imagine the plot in an RPGMechanicsVerse.

** While the Assassination Classroom increasingly become better in assassinations, none of students are actual professional assassins (except maybe Ritsu who is a robot) and never become as such. The series introduces several actual professional assassins who are much more skilled than the class, with each of them having particular quirks. The only reason why they far worse than Class 3-E is because they are too unfamiliar with Koro-sensei and lack combined teamwork of 28 people to do the job right.

* AnAesop: The series goes for numerous Aesops about education, personal attention, and effort. In particular, the show takes the stance taken against institutionalized corruption, seen in both academia and government, and how they create systems that mostly do harm to those that such systems should be in place to help and serve.

* ArtisticLicensePhysics: Koro-Sensei moving around at several times the speed of sound should cause immense winds that would swiftly destroy the classroom and everything in it, but it doesn't even make the students' hair flutter.

** Season 1 of the anime closes with the students enjoying the last night of their island vacation by having fun at the nearby beach.

* BeachEpisode: In chapter 43, Koro-sensei builds a pool for the students so they can find relief from the summer heat. Ties in to the main plot when it leads to them discovering that [[spoiler:Koro-sensei can't swim]].

* BittersweetEnding: [[spoiler:Koro-sensei finally dies at the hands of Class 3-E after killing the second "Reaper", his treacherous ex-apprentice, and brutally maiming Yanagisawa, the scientist who turned him into what he is now. However, far from celebrating having saved the world, they instead mourn him after spending a year developing intellectually, physically and emotionally under his tutelage (made all the more heartbreaking by the fact that killing him was already largely optional at that point, as his chances of blowing up were actually 1%, but they were forced to do what they had to before a government KillSat did so). Nevertheless, all 28 students graduated with newfound confidence and sense of self-worth, ready to apply their lessons to lead better adult lives.]]

** In chapter 155, Koro-sensei is seen messing around with speech and thought bubbles.

* BrickJoke: The cellphone pictures Karma and Nakamura took of [[spoiler:Nagisa and Kayano's BigDamnKiss]] make a comeback in chapter 159 when they show it to an unsuspecting Kayano. Her reaction was hilarious.

** All the way back in chapter 2, Nagisa's English journal entry mentions sushi is his and his father's favorite food, and in chapter 76 the two of them have breakfast together at a sushi bar.

** The "[[NotSoExtinct weasel]]" which appears in the end of chapter 56 returns in chapter 88 to destroy the mini-tank of the boys.

* CerebusSyndrome: Though there are still many moments of comedy, as the series reaches its last half, the tone gradually gets darker, with Koro-sensei's explosion looming on the horizon. Notable incidents include the raid on the Fukuma Palace Hotel [[spoiler:to find an antidote for an (apparently) lethal virus that has affected some of the students]] and the first appearance of [[spoiler:the "Reaper"]]. Then things get bleaker with [[spoiler:the revelations of Kayano's true identity and Koro-sensei's tragic past, leading to internal strife which led to a civil war game]]. Then, after a brief respite with the Valentine's Day arc, [[spoiler:the government, implicitly under the thrall of Shiro/Yanagisawa, concocts a failsafe plan to assassinate Koro-sensei, forcing the class to go through with their deal with Koro-sensei and finally kill him]]. Even the opening themes between both seasons reflect the shifting tone -- cheerful in the first, melancholy in the second.

** Koro-sensei's habit of grooming attackers at super speed? [[spoiler: Extra Chapter 4 reveals it was part of his training in special surgery, which pays off there to heal and remove the tumour from a woman's brain, and in the final arc of the main story for saving Kaede.]]

* DoWrongRight: Koro-sensei welcomes the kids' attempts to kill him - but demands that, if they are going to carry out an attack, to at least be original and not cause problems for bystanders.

** In chapter 86, Karma comes out of nowhere and pulls off a two footed kick against Shiro's goons, while Maehara takes out another in the background of the same panel with a one footed version.
* EarnYourHappyEnding: [[spoiler:''Everyone'' in Class 3-E, plus Irina and Karasuma, get to go on to be happier, more confident people, each having found a fulfilling career and maintaining their friendships even years after graduation, showing they didn't undergo a year's worth of trouble (and several years' worth of bullying even befoe Koro-sensei showed up) for nothing. Even Koro-sensei earns his BittersweetEnding; he does die, but he does so on his own terms, and he gets to reunite with Aguri, having spent a year honoring her last wish and leaving the world better than when he found it.]]
* EarlyInstallmentWeirdness: Threatening the world is one thing, but the first chapter ends with Koro-sensei threatening ''his students' families''. The threat was made to counter the ideas certain students had that it was okay to ''[[MoralEventHorizon bully other students into effectively becoming suicide bombers]]'', and bonding and character development within the entire class have made that threat effectively non-existent. However, knowing him like we do now, it was an extreme action to take. [[spoiler: However, considering his backstory and what [[http://microlm.tumblr.com/post/116977642118/ok-but-seriously-he-like-photocopied-her this post]] points out, he was just starting to get into his new identity.]]
* EasterEgg: On the newspaper page with the baseball player being attacked by Koro-sensei's tentacles, there's a side article captioned by the quote "My wife is a slut".

** In later chapters, Asano Jr. begins to believe that his father's teaching methods aren't right, and balks when his father, unsatisfied with Class 3-A's [[spoiler:modest victory over Class 3-E at the school festival]], suggests that he should have [[spoiler:achieved an ''overwhelming'' victory by sabotaging their ramen restaurant and poisoning their food]]. As of the end of chapter 118, he begins to see the monster his father truly is.

** Following the "Reaper" arc, the Season 2's first opening from Episode 9 onwards reflects [[spoiler:Irina's GoodCostumeSwitch as well as her and Karasuma facing each other and the "Reaper"'s maskless face]].
** Season 2's second opening (Episode 15 onwards) changes to show how many days the class has left to kill Koro-sensei.

* ExactWords: Used with Koro-sensei's teaching agreement with the government, which is not to harm any of the students.
** Right in the beginning, after Terasaka nearly made Nagisa an anti-sensei suicide bomber, Koro-sensei warns them not to do something like this again, threatening them that just because he is banned from hurting them ''doesn't'' mean he's also banned from hurting their closest relations.
** Because Ritsu, a military machine designed to assassinate Koro-sensei with the AI interface of a middle-school girl, is also enrolled as a student, Koro-sensei also has no recourse against her. He even [[LampshadeHanging points out]] that the government is exploiting a loophole in their agreement. However, it gets reversed when the class, fed up with her assassination attempts interrupting their lessons, retaliate via Terasaka duct taping her gun ports shut, as ''they can'' interfere. Koro-sensei then decides helping Ritsu go beyond her programming isn't "harm", exploiting it further in the class's and his favor.
** Koro-sensei agrees to let the students shoot one tentacle for each of them that takes the top spot in the first term exams. Cue Terasaka, Muramatsu, Yoshida and Hazama taking the joint top spot in ''home economics'', which allows them to make one shot each.

* FlashBackEcho:

** In chapter 28, Koro-sensei takes several students to see an American {{superhero}} movie, wherein the major PlotTwist involves the BigBad being revealed to be the heroine's brother. At the end of the chapter we meet [[spoiler:Itona, Koro-sensei's AxCrazy "younger brother".]] Or, from another angle, despite being a main character Koro-sensei ''was'' built up to be the BigBad, but its later revealed the true BigBad is [[spoiler:Shiro/Kotarō Yanagisawa. It's later revealed that Shiro was Aguri's fiance, making him Kayano's ''older brother-in-law''.]]

** In chapter 67, Karasuma vaguely recognizes two of the mastermind's minions because he had seen them before [[spoiler:in Takaoka's photographs of the soldiers he had previously trained, foreshadowing the mastermind's identity.]]
** The "Reaper" is holding a rose and a bouquet of flowers when he's first described by Lovro. [[spoiler:He first appears to the students of Class E as an unassuming flower salesman, offers Kanzaki a rose, and sells them a bouquet of flowers for Irina's birthday]] before the story reveals his identity.
** In chapter 90, Koro-sensei says that the only ikemens (hot guys) in the class are Isogai, and himself. [[spoiler:Come chapter 134, we see he was actually a fairly good-looking man.]]

* FracturedFairyTale: Class 3-E's school play is a rendition of the legend of Momotarō done this way - courtesy of [[NightmareFetishist Kirara]] handling the screenplay.

* GratuitousEnglish: More like "Gratuitous IPA English". On the cover page of chapter 55, the word assassination is rendered as əsˈæsənˌeɪʃən, which would actually be assassination, with the first "ass" as its own syllable. The correct rendering would be əˈsæs.ɪnˌeɪ.ʃən. Let this stand forever as the most pedantic entry on the page.

** During the baseball game between Class E and the Baseball Club, in the second inning the latter use the same batting strategy the former used in the first, so Class E uses the same defensive strategy the Club used in the second inning during the third - and the umpire cannot say anything, since he allowed it earlier.

** Nagisa's father, who is often absent due to his work, appears in chapter 76. He seems to be nice, and it's mentioned that Nagisa's mother is strict. [[spoiler: Chapter 112 reveals that "strict" is a severe understatement.]]
** Takebayashi's parents (chapters 78 and 79) aren't happy with his poor grades and are shown to be quite distant from him at home [[spoiler:and because of that, he [[TenMinuteRetirement leaves Class E for a couple of chapters]]]].
** Kimura's parents and Kirara's mom are shown in a flashback in chapter 89.

* KillTheOnesYouLove: [[spoiler:At the end of Chapter 177 Class 3-E finally kills Koro-sensei at his behest after defeating Shiro and the second "Reaper", with Nagisa dealing the fatal stab while the rest pin him down. However, by that time the students had already grown close to him, who had shown them the love and care their previous homeroom teachers denied them, as well as helped them to gain confidence and develop intellectually, physically and emotionally, so understandably all of them broke down crying over what they had done.]]

** PlayedForLaughs when Yuuji notices a large number of sketchy looking customers (Lovro, "Red Eye", "Gastro", "Smog" and "Grip") at Class 3-E's school festival cafe. Nagisa tries to come up with increasingly ridiculous excuses to hide the fact that they're all professional hitmen.
--->'''Yuuji:''' Why does he ("Red Eye") have a gun? Maybe we should call the police...\\

* NotSoExtinct: The Japanese river otter, declared extinct in 2012, appears in chapters 56 and 88.
* NotSoForgottenBirthday: Due to the events of the athletic festival and the second mid-term exams, the students forget about Irina's birthday. To make it up to her, [[ShipperOnDeck they secretly arrange for Karasuma]] to present her with a birthday gift. [[spoiler: The plan backfires thanks to Karasuma's blunt insensitivity towards her feelings, setting the stage for the "Reaper" to manipulate her into betraying the class.]]

* OneHitKill: Lovro's "secret killing technique" is designed to turn the tide of a battle between a skilled combatant and an assassin to the latter's favor. It's extremely effective, but only works under very specific conditions. He teaches it to Nagisa, who eventually [[spoiler:[[ChekhovsGun uses it to defeat Takaoka during their rematch at the climax of the Assassination Island arc]]. And when the "Reaper" demonstrates his advanced version of the technique, it's revealed that pulling it off at just the right moment will paralyze the opponent for a few minutes. It's appropriately dubbed the "clap stunner"]].

* PrettyLittleHeadshots: Averted, as much as is possible for a manga aimed at this age group. When the "Reaper" recalls making a kill by [[ImprobableAimingSkills firing between two Shinkansen lines going in opposite directions]], we see his victim from the exit wound side of his head, with a very large spray of blood.

** The technique Lovro taught Nagisa basically amounts to [[spoiler:clapping in a heated battle. The point is to disrupt the enemy's concentration for a moment through the noise as they would not expect such a move, and leave him open for another sneak attack. The "Reaper" developed this further, not only disrupting concentration, but utterly shattering the psyche]]. This technique seems silly yet effective at first, but is actually based on [[spoiler:a real sumo technique known as ''nekodamashi'', which operates upon the same principle: temporarily break the enemy's concentration to create an opening]].

** Meg Kataoka's first name used to be spelled "Megu" pretty often in translations.

* TrainingFromHell: Deconstructed with regards to Takaoka's method of teaching, which employs this trope - the students won't stand for it, and all the adults think that he's a psycho.

** Chapter 133 reveals that Koro-sensei [[spoiler:was the "Reaper" before the one Class 3-E, Karasuma and Irina defeated earlier.]]
** Chapter 134 might be the Whammiest yet: [[spoiler: Koro-sensei's human form is shown for the first time, and Shiro was one of the scientists experimenting on him. Also, the "Reaper" defeated by Karasuma used to be an apprentice of Koro-sensei, who is implied to be the assassin who murdered his father.]]

* AntagonistTitle: At first, Episode 21 is called "XX Time". However, once the true mastermind behind the Assassination Island arc is revealed to be [[spoiler: Akira Takaoka]], the true title of the episode is [[spoiler: "Takaoka Time".]]

* EverybodyKnewAlready: After his first match with Itona, Koro-sensei decides he has no choice but to reveal a shocking truth about himself. He is actually an artificially created creature. No one in the class is surprised since Koro-sensei already said he isn't an alien and an artificial being was the only explanation left.
-->'''Entire class:''' "Well, duh. And?"\\
'''Koro-sensei:''' "What a weak reaction! That was a pretty shocking thing to confess, wasn't it?!"

* AHouseDivided: The class turns into this [[spoiler: at the start of the final term, with some wanting to try to find a way to save Koro-sensei's life and others preferring the security of coming up with a way to kill him, with Nagisa and Karma respectively leading the factions]]. Koro-sensei declares it will be settled with a game of paintball in order to prevent this trope from going too far.

* KansasCityShuffle: During the island assassination attempt, Koro-sensei uses his keen sense of smell to deduce that Chiba and Hayami, the class' best snipers, plan to deliver the killing blow from a nearby mountain. [[spoiler: What he detected were dummies set up by the students to lure his attention away from the snipers' true hiding spot underneath the ocean.]]

-->'''Nagisa:''' "Stop it, Professor Bitch! I can't breathe over your enormous tatas!"

-->'''Karasuma:''' "You're a bad example to the students. I'm going to have to ask you to leave the classroom."

** Centipedes for the Chairman and his son.

** [[spoiler: "The tentacles asked [me], 'What would you like to be?' [I] answered..."]] becomes one later in the series. It's used by every character that [[spoiler: acquired tentacles in summation of their flashbacks explaining what led to them seeking the power they provide.]]

* PublicDomainSoundtrack: During the Island arc, Irina plays [[Music/FredericChopin Chopin]]'s "Fantaisie-Impromptu" on the piano to distract the hotel guards so that the students can get past.

* ShaggyDogStory: A mysterious person [[spoiler:infects Class 3-E with a virus that will eventually lead to a slow and agonizing death]]. Instead of handing over the helpless, immobile Koro-sensei in exchange for [[spoiler:the antidote]], the teachers and students [[spoiler:who have not yet succumbed to the virus]] spend an entire arc infiltrating a dangerous hotel full of bodyguards, assassins, and [[ArsonMurderAndJaywalking spoiled brats]] in order to steal it from the mastermind. The mastermind, [[spoiler:who turns out to be a vengeful Takaoka]], renders all of their efforts pointless by [[spoiler:blowing up the antidote in front of the class]]. [[spoiler: Subverted when it's revealed that Takaoka's assassins, who weren't nearly as sadistic and unprofessional as their boss, secretly swapped the lethal virus with a harmless stomach bug.]]

* SoundtrackDissonance: In Season 2 Episode 14, the peaceful piano theme, [[https://www.youtube.com/watch?v=8bHqJXlCRsY "Odayaka na Asa"]] (lit. "Calm Morning"), plays when Nagisa, Kayano, and Koro-sensei were cleaning the school's storage shed and reminiscing on the past few months they've been together, [[spoiler:and then the theme continues to play as Kayano reveals her tentacles for the first time, getting more distorted as the scene plays out]].

* SuddenSoundtrackStop: In Season 2 Episode 22, [[spoiler:a hopeful piano tune plays as Koro-sensei is about to blow the candles on the birthday cake his students had gifted him. The tune suddenly halts as the cake is attacked from afar by the Reaper's tentacle.]]

* PocketProtector: Karasuma manages to stab Koro-sensei in his chest, but Koro-sensei reveals that the knife had dug into his copy of ''Literature/AlsoSprachZarathustra'' that he had saved in his pocket prior. Not that it matters, since Koro-sensei later demonstrates that regular knives will simply melt on contact with his body.
* PublicDomainSoundtrack: Music/FranzSchubert's ''Ave Maria'' plays in the opening and end credits of the short.

''Assassination Classroom'' was serialized in ''Weekly Magazine/ShonenJump'' from 2012 to 2016 for 187 chapters, which were compiled into 21 volumes (notably, it did not fall below 4th place in the ''Weekly Shonen Jump'' TOC rankings once over its entire duration). The manga is licensed in English by Creator/VIZMedia. Two [=OVAs=] premiered during the 2013 and 2014 Jump Super Anime Tours, and a two cour TV anime adaptation produced by Creator/{{Lerche}} premiered on January 9, 2015, with its second season debuting a year later on January 7, 2016. Creator/{{Funimation}} has picked up the rights to stream and dub the anime. In Australia, Creator/SBS2 is airing the anime. The show made its American television premiere on Creator/AdultSwim's Creator/{{Toonami}} block on August 29, 2020.

* BrickJoke:
** The cellphone pictures Karma and Nakamura took of [[spoiler:Nagisa and Kayano's BigDamnKiss]] make a comeback in chapter 159 when they show it to an unsuspecting Kayano. Her reaction was hilarious.
** Koro-sensei had made ''thousands'' of [[spoiler: embarrassing photographs]]. While some are new to the audience, many are a flashback to awesome and heartwarming moments from the story. [[spoiler: [[TearJerker And then he spends his supposedly final moments organizing them into a ten thousand page graduation album...]]]]

** Creator/TakehitoKoyasu, who previously voiced Neuro in ''Manga/MajinTanteiNougamiNeuro'', got [[StuntCasting cast]] in a minor villain role as hitman Gastro.

* PitTrap: The Reaper uses one against Koro-sensei, causing him to fall into the same cell that Class 3-E is locked in. [[spoiler:Inspired, Kayano later built one filled with Anti-Sensei bullets hidden inside the school's supplies shed, which she uses along with her tentacles to try killing Koro-sensei, although Koro-sensei manages to escape this time around by firing an energy blast into the side wall and then digging his way out.]]

* PrecisionFStrike: Used during the opening for Episode 17, when Kunudon finds out that [[spoiler:Class E gets to go on the exclusive vacation]]. It is the only time in Season 1 of the anime that the "f-bomb" is used, albeit the dub censors it.

* RecycledInSpace: It's ''Manga/GreatTeacherOnizuka''. With an alien.
** [[spoiler:Which is funny because they DO go to space.]]

* RevealShot: After Karasuma sees a happy group photo of Takaoka with his JSDF students. [[spoiler:He then finds a photo from the reverse angle, which shows that the students have their hands tied behind them and welts and scars all over their backs.]]

* GoroawaseNumber: Koro-sensei is sometimes associated with the number 56 (which can be pronounced as "Ko-ro"). His baseball uniform has "56" on the back, and one ImagineSpot of Koro-sensei and Itona together has the former holding a board with "56" written on it.

* IdiosyncraticEpisodeNaming: So far all of the chapters have the word "time" in them. This can be interpreted as a reminder that Class 3-E only has a whole year to kill Koro-sensei before he blows up Earth, as well as an alternate reading on "class period" (some chapters even have the exact same title as a previous chapter with the phrase "2nd Hour" added to the end of it, befitting with the series' school theme).

* SignificantNameShift: Karma and Nagisa refer to each other by their first names as Nagisa's parents are separated so he doesn't want any confusion and Karma just likes his name. However, they add on suffixes when talking to each other, demonstrating they aren't that close. It turns out that [[spoiler:Karma has always sensed Nagisa's bloodlust and distanced himself from his friend out of fear]]. Once they resolve their issues, the two drop the suffixes to show their closeness.
** Korosensei himself, aside from the whole "destroy the planet in a year" thing, does not kill or significantly injure anyone, at least onscreen. Other assassins have no such restrictions, so they often take advantage of Korosensei's inability to retaliate by mercilessly abusing his desire to protect his students.
* SaveOurStudents:
** Koro-sensei is at Kunugigaoka Middle School to help their lowest-performing students excel... through a liberal application of superpowers and some rather unusual extracurricular activities. Avoids {{Glurge}} by making his successes not a matter of whether he cares or not, but due to the fact that he is just an inhumanly good teacher.
** Subverted occasionally. He's not the end-all for their grades, as shown when Karma drops several points in the first round of finals despite Koro-sensei's efforts because he didn't care enough to study. Koro-sensei also learned after the first midterms that he needed to set more reasonable goals for his students than he previously had.
* ScareEmStraight: Parodied. Koro-sensei draws a short comic that is presented as if it were this to Kataoka to warn her that she may grow up to be dangerously codependent if she does not learn to stand up for her own needs more. It's much funnier in the manga than how it is described here.

** In the anime, when discussing which of the boys the girls think are most attractive, they all agree that it would easily be [[AllGirlsWantBadBoys Karma, if only he were less evil]].

* SpellMyNameWithAnS:
** It took a while for the official readings for everyone's names to come out.

* SpoilerTitle: Episode 21 is called [[spoiler:"Takaoka Time"]], revealing you-know-who has returned.

* SurprisinglyGoodEnglish: Instances of written English in the manga and the anime are all well written and grammatically correct.
** In an interesting version of playing the trope straight by subverting it, the English in one question on the midterms is not grammatically correct, nor is it supposed be as it's really a quote from ''Literature/TheCatcherInTheRye'' which does not use proper English. The student who translated it literally was marked down, while the one who recognized it as a quote and wrote it as it would be in the English version of the novel such got the points.

-->'''Korosensei:''' How do you do? I'm the one that blasted your moon. I plan to do the same to Earth next year. Now I'm your teacher. Nice to meet you.
-->'''Students, in perfect unison:''' There are at ''least'' six things wrong with this picture!
-->'''Nagisa, narrating:''' [[CaptainObvious The feeling was unanimous.]]
* ThouShaltNotKill: Everyone except for Korosensei is off-limits for Class 3-E. He has only had to explicitly forbid his students from killing humans twice: once before they went up against Gastro, and the other to prevent [[spoiler: Nagisa from murdering Takaoka]].
* ThrowTheBookAtThem: In chapter 17, Nagisa, Karma, Sugino and Okuda knocked their friends' kidnappers right out with a good whack from their guidebooks on the back of the head.

* TrainingFromHell: Deconstructed in the first Takaoka arc - the students won't stand for it, and all the adults think that he's a psycho.

---> '''Shiro:''' [[spoiler: All right, number two. Time to begin. As bearers of the same bloodlust, let us kill number one.]]

---> '''Azusa''': Yes... everyone is so kind... and thanks to that... '''[[spoiler: my carefully laid plans were almost ruined.]]'''

** Nagisa with a snake, as a metaphor of his ability [[spoiler:to hide murderous intent in plain sight]].

-->"There isn't a single student stronger than him in this school." ''[speaking with regards to [[spoiler:the Chairman's son]]]''
-->''[cut to a yawning Karma]''

** When the class [[spoiler:sings HappyBirthdayToYou to Koro-sensei]] right before the climax, Terasaka wonders if they even have the legal rights to do it.

* BlandNameProduct: In chapter 2, the K.Y. Times for the New York Times, and the Turkies for the New York Yankees. The Pocky seen throughout the series is known as Pooky. There's also 5 Up soda, Jac Danas whiskey, and ([[SubvertedTrope rather unblandly named]]) Void brand computers.

Despite the outlandish and somewhat foreboding premise, ''Assassination Classroom'' (''暗殺教室'' / ''Ansatsu Kyoushitsu'') is a lighthearted, action-packed comedy with several realistic, SliceOfLife elements woven into its story. Imagine a less explicit ''Manga/GreatTeacherOnizuka'' mixed with sci-fi and espionage to get an idea of what you're in for.

''Assassination Classroom'' was serialized in ''Weekly Magazine/ShonenJump'' from 2012 to 2016 for 187 chapters, which were compiled into 21 volumes (notably, it did not fall below 4th place in the ''Weekly Shonen Jump'' TOC rankings once over its entire duration). The manga is licensed in English by Creator/VIZMedia. Two [=OVAs=] premiered during the 2013 and 2014 Jump Super Anime Tours, and a live-action movie adaptation premiered on March 21st, 2015 (as well as a sequel in 2016 which covers the second half of the story). Creator/{{Funimation}} has picked up the rights to stream and dub the ongoing two cour TV anime adaptation, which premiered on January 9, 2015. In Australia, Creator/SBS2 is airing the anime. The show made its American television premiere on Creator/AdultSwim's Creator/{{Toonami}} block on August 29, 2020.


The series counts with an ongoing, non-canonical SpinOff manga entitled ''Manga/KoroSenseiQuest''. Basically imagine the plot in a [[RolePlayingGameVerse Role Playing]] RPGMechanicsVerse. (The Q stands for [[VideoGame/DragonQuest Quest]].)

A LiveActionAdaptation film called ''Assassination Classroom'' produced by Creator/{{Toho}} was released in Japan on March 21, 2015. A sequel called ''Assassination Classroom: Graduation'' (''Assassination Classroom: Sotsugyō-hen'') was released on March 25, 2016.

* StockholmSyndrome: What Takaoka's "9 sticks to 1 carrot" training strategy invokes. [[spoiler:Once Koro-sensei's existence is revealed to the public, Class 3-E's attempts to defend him are brushed off as this.]]

* ArtisticLicenseGeography: Actually, Koro-Sensei passed the Philippines the first time he crossed the world in [[https://www.youtube.com/watch?v=ULWGpwuLbJ0 his drawing song]]. It's Indonesia he crossed when crossing back to Dubai. This inaccuracy only exists in the anime adaptation.