Episode 1

Assassination Time (暗殺の時間) is the first episode of the Assassination Classroom anime. The episode first aired on January 9, 2015.

Overview
Class 3-E of Kunugigaoka Junior High School is the left-over bunch of misfits of the school whose homeroom teacher is the creature that blew up 70 percent of the moon, turning it into a perpetual crescent and plans to do the same to Earth in a year's time. The Japanese government tasked them with assassinating their teacher before that happens, with a reward of 10 billion yen on the line.

Summary
Class 3-E is nervously awaiting the arrival of their homeroom teacher, who is currently flying to school at top speed. Soon, he lands in front of the school building and makes his way to class. Once there, he sets the rollbook on his desk and calls for homeroom to begin, telling the student who was on welcome duty to call the command. Nagisa calls it and everyone stands ready with their firearms and begin to fire when he yells "Bow!". The teacher dodges the bullets and begins taking roll.

After roll call is finished and the students are worn out, the teacher expresses his happiness as there are no absences. The students begin complaining about how he's too fast and that shooting at him all at once doesn't work. The teacher comments on how a single bullet didn't hit the mark and that a strategy that relies solely on numbers lacks individual thought and that the students need to be more creative or else they'll never be able to kill him at his maximum speed of Mach 20. The students start complaining again, calling him out and saying that the bullets are just BB pellets and that there was no way he dodged them seriously. The teacher then asks for them to gather up the BBs and give them to him.

He proceeds to shoot one of his own tentacles off to show that the BBs do in fact harm him even though they're harmless to humans and that they were developed by the government to specifically kill him, given a few seconds and he regenerates. He also tells them that regardless of whether the BBs are harmless to humans, they could injure themselves so no shooting in the classroom unless they're trying to kill him. He then proceeds to mock them, saying that he does hope they can kill him before graduation. After, he tells the students to put the guns and BBs away and calls for class to begin.

The class has begun, and the teacher is in the middle of the English lesson. He asks Isogai a question, and he correctly answers the question. While continuing, Kayano whispers over to Nagisa and shows him the crescent moon outside the window. This prompts Nagisa to wonder and think back as to how he and the rest of Class E ended up in this situation, noting that two things happened at the beginning of their third year:

The first thing was the moon suddenly exploding into a crescent, which caused a breaking news report for it all over Japan. The second thing was the creature who destroyed 70 percent of the moon appearing in Class 3-E, declaring that he'll do the same to Earth in a year's time, stating that he's now their homeroom teacher and prompting the entire class to feel that there were so many things wrong in this situation. A man from the Japanese Ministry of Defense then introduces himself as Karasuma. He tells the class to understand that what he was about to tell him was a top government secret.

He's blunt and tells the students that he wants them to kill that creature, surprising them. Mimura breaks that surprise by asking if the creature was the alien who attacked them. The creature is offended and claims that he was born and raised on Earth. Karasuma states that though he can't discuss the details, the creature is telling the truth and that next March, the creature will destroy the Earth like he did the moon. He tells the class that only the world's leaders know about this and that if news of the creature gets out in public it'll cause a global panic and that they have to kill him in secret; in other words, an assassination.

Karasuma pulls out an Anti-Sensei Knife and begins attacking while explaining the creature's abilitys. But, the creature is incredibly fast and while dodging begins to meticulously trim Karasuma's eyebrows. He explains that the creature is a super creature who can turn the moon into a crescent and has a max speed of Mach 20. If he gets away, Earth will be left helpless, awaiting its destruction. The creature closes his eyebrow trimming kit and states that just destroying the Earth isn't fun. So, he made a deal with the government: no killing him, and instead, he'll teach Kunugigaoka's Class 3-E. Karasuma states that they don't know his reasons. Still, they were forced to agree on the condition that he doesn't harm any of the students and that there were two reasons. First, if the creature comes to the classroom every day, the government can monitor and know his location most days. The second was that it gives thirty people the means and incentive to kill him from an extremely close range.

The flashback ends as Nakamura tries to shoot the teacher. The teacher scolds her and tells her to not let assassination interfere with her studies. She apologizes and the teacher tells her to go stand in the back and think about what she had done. Nagisa begins thinking back again with unanimous questions from the class, such as how were they supposed to kill the creature, when the government couldn't. These questions were faced with the assassination's final condition: a successful assassination will be rewarded with 10 billion yen. It was only right as a successful assassination would literally save the Earth.

Karasuma tells the class that luckily, the creature doesn't think much of them. The creature's face is now yellow with green stripes and Karasuma explains that it means he's mocking them. He agrees and says that if the government can't kill him, how can the students and that the government even sent their best fighter jets, but he gave them a midair wax. Karasuma tells the class that they must find an opening in his defenses and strike at it. They will be supplied with weapons and ammo that won't harm humans but will harm the creature. He also tells them that they must keep this a secret from their friends and family and that there's no time to lose.

The creature then tells the class to let's make the most of their remaining year. The flashback ends once more with Nagisa noting that they only have one year and that if they don't manage to assassinate their teacher, the Earth will be destroyed.

The lunch bell sounds and the teacher says that he's going over to China to have some Mapo tofu and if anyone wants to assassinate him, just call him up on his cellphone. He leaves at Mach 20 and the students calculate that it'll take him about 10 minutes to get to China's Sichuan province, the home of Mapo tofu. They also note that even if they had missiles, no missile could probably shoot him down.

They begin to note at how the teacher, referring to him as an "octopus", even grades paper while going faster than the speed of sound and that he's really good at teaching. Mimura then says that regardless they are Class E and Okajima adds in that no matter, trying hard won't do much. Nagisa notes that the super octopoid teacher and their assassination target was, for some reason, a really good teacher. They were normal students apart from being impromptu killers, but Class E is slightly different from the rest. Terasaka then calls out to Nagisa and tells him to come with him and his friends to go over their assassination plan.

Outside, Nagisa goes over his observations of the teacher that Terasaka asked him to do. He begins to explain Korosensei's changes in color and what they represent. When he is about to go into another observation he made, Terasaka states that he doesn't need to know all that and that he has a plan: When the teacher lets his guard down the most, Nagisa is going to carry out the plan.

Nagisa is hesitant and Terasaka tells him not to be such a goody-goody; they are Class E. The misfits of the famous prep school Kunugigaoka, calling them the E-as-in-End Class. Every day the people of the main school send them to an isolated mountaintop campus and discriminate against them like they're trash. Because of that, they could possibly never get another chance like this one to earn ten billion yen. Terasaka takes out a small draw-string bag and gives it to Nagisa and tells him to not screw up. Nagisa then thinks back to when he was dropped to Class E. He recalls the ridicule and rejection from his fellow classmates.

While thinking back, he hears his teacher's flying who lands in front of him, holding a missile. He asks his teacher why he has that and he replies that the Japanese Self-Defense Force ambushed him in the Seas of Japan. Nagisa says that it must be terrible to be a target to which his teacher disagrees, saying that one knows they're powerful when everyone has it out for them. He then begins to head inside, saying that it's time for the fifth period to begin.

Nagisa reluctantly says yes and thinks to himself that his teacher doesn't understand. If one is everyone's assassination target, that means they acknowledge their power and that a creature like that wouldn't understand what it's like to be unworthy of anyone's expectations, fear, or even their recognition. He thinks back to what his old hateful teacher said to him once he got dropped to Class E due to his low scores and then feels that he may kill the creature that is his teacher and that that teacher probably doesn't even see him.

The fifth period has begun, and the teacher tells the class to compose a short poem to go along with their theme and that the final line should end with "was tentacles all along", and that when they're finished to bring them to him for he'll be checking for creativity, grammar, and overall beauty of expression. He recites an example and tells the class that afterward, they could go home. Kurahashi asks him how they were supposed to write about that. The teacher asks them if any wonderfully slithering phrases are coming to mind. He proceeds to "slither" and Maehara tells him to cut it out.

Kayano then calls out to ask a question and asks the teacher what his name is and that how will they know what teacher they're referring to. The class notes that the teacher never gave it to them. The teacher tells her that he isn't really the kind of name one tells a person and to go ahead and pick one for him. But for now, she should focus on her schoolwork. He then goes into a little "break," and his face turns light pink, signaling that he's tired. Nagisa gets up with his poem in hand and steadily walks over to him, hiding a knife and the folded paper. He begins noting that after lunch, around the time everyone gets sleepy, the teacher's face sometimes goes light pink.

He was even a little slow responding to Kayano's question and that this might be when he's most vulnerable. He then notes that the prep-school failures are always thinking, "we have to get back at them somehow" and always told that they could do it if they tried.

Once he reaches the teacher, he pulls out his knife and strikes only to be stopped. The creature then tells him that he said to be more inventive. At that moment, Nagisa reveals the grenade and latches on to the creature thinking that they have to prove themselves by any means necessary. Terasaka pushes the button that makes the grenade go off, and BBs fly everywhere. Terasaka, Muramatsu, and Yoshida begin cheering and the other students go off at him asking what did he do [to Nagisa].

Terasaka tells them that he gave Nagisa a toy grenade but filled it up with gun powder and three hundred anti-sensei bullets at high speed. He states that it's not strong enough to kill anybody. Still, he'd use his ten billion yen to cover Nagisa's medical bills. He discovers a thick membrane covering Nagisa. The teacher's voice is heard, telling the class that he sheds his skin once a month, using his old skin to protect Nagisa. The creature reveals himself on the ceiling with the air turning ominous.

His face begins to turn pitch black, signaling that he's furious. He then speeds out of the room and throughout the town at Mach 20. He comes back with Terasaka, Yoshida, Muramatsu, and the rest of the students' house nameplates. He threatens them by saying though he made an agreement with the government to not harm them. They never said anything about their families. Suppose they try another assassination like that one, he may just kill their families and friends, or rather the whole planet apart from them. Nagisa notes that five seconds and the class knew; there was no running to the ends of the Earth for them and that if they really wanted to run, they would have to kill their teacher.

Terasaka goes off and tells his teacher that he is not afraid of him. He calls him out on destroying the moon and that people have the right to defend themselves. The ominous air suddenly disappears. The teachers face orange with a circle telling them that the plan wasn't irresponsible for trying to kill him. He especially praises Nagisa for keeping his technique and movements natural until the very end. He also reprimands Terasaka, Yoshida, and Muramatsu for not looking out for Nagisa's well-being and to Nagisa for not looking out for himself.

He says that students like that aren't fit to assassinate anyone with his face turning purple with an "X" to emphasize his point. He tells the class that they must believe themselves worthy of a target and take pride in what they do, themselves and each other. All of them are more than the sum of their parts. Nagisa notes that being chewed out at Mach 20 then praised with waving tentacles, this unusual education is growing on him. When one spends their whole life being invisible, it's something to feel like you're being seen.

The teacher notices a piece of sizzling wood on his desk and thinks back. He is in a decimated building, holding a bleeding woman and telling him that she wants him to teach the children [Class E]. That with those incredible tentacles of his, he'll surely be an excellent teacher. He then puts the wood out and asks Nagisa a question: he doesn't have the slightest intention of being killed; he will enjoy his time with them until next March and then blow up the Earth.

If he doesn't like it, what will he do about it? Nagisa notes that they've never assassinated someone before and that there's plenty of other stuff they should be doing. Still, he feels that even the teacher will accept his bloodlust. He then tells him, with a smile, that he will kill him before he destroys the Earth. The teacher has his mocking face on and tells him to go on and do it, telling the class that they can go home once they kill him, leaving the class in disbelief.

Nagisa heads back to his seat once more, noting that they are killers, and their target is their teacher. Korosensei goes back to cleaning. Kayano begins thinking about how their teacher is unkillable, prompting the name "Korosensei," with Nagisa stating that it's them and Korosensei in their assassination classroom.

Differences From the Manga

 * In the manga, some of the students are wearing protective eye gear. This is removed in the anime.
 * In the manga, Maehara wonders if Korosensei is pretending to not getting hit by the BBs. In the anime, Sugino asks it instead.
 * When Korosensei tells the students to clean up, we see them doing as such as Nagisa narrates in the manga. In the anime however, we simply see the 3-E sign and a closeup of Korosensei's face while doing so.
 * In the manga, Korosensei asks Kimura which of his tentacles is pointing at the right sentence, whereas in the anime, instead he asks Isogai which one stands out.
 * The anime expands on Nagisa's narration about the moon showing several newscasts throughout the world before Korosensei introduces himself to Class 3-E.
 * Also in the manga, Karasuma's assistant is holding a handgun at Korosensei. In the anime, he is holding a rifle.
 * In the anime, Korosensei hacks the world leader's screen from the moon showing his arrogant face. In the manga, both the moon and Korosensei (in a Santa outfit, for some reason) are on the screen at the same time.
 * The anime also includes an extra shot of their studies on Korosensei's anatomy.
 * In the anime, Korosensei is still teaching after the end of the backstory. In the manga, it ends right as the lunch bell rings.
 * In the anime, Nakamura asks how long it will take Korosensei to get to China, which Nagisa answers. In the manga, Isogai compliments his speed while Hara tells them how long it will take.
 * Also in the anime, Maehara asks about missiles which Isogai comments would be impossible. In the manga, Maehara is the one who comments on the difficulty, while another student (possibly Isogai) expresses shock that Korosensei is grading while flying.
 * When Nagisa is explaining Korosensei's X and O faces, in the manga, Isogai is answering the question. In the anime, instead it is Okajima.
 * Korosensei's poem requirement is slightly different, in the manga, the poems should end with "tentacles", while in the anime, he wanted to them end with "was tentacles all along".
 * In the manga, when Korosensei gets pitch black, only Terasaka and Nagisa's fearful expressions are shown. In the anime, the scene is slightly extended showing several of the other students reactions to his anger.

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