When a mysterious creature chops the moon down to a permanent crescent, the students of class 3-E of Kunugigaoka Middle School find themselves confronted with an enormous task: assassinate the creature responsible for the disaster before Earth suffers a similar fate. However, the monster, dubbed Koro-sensei (the indestructible teacher), is able to fly at speeds of up to Mach 20, which he demonstrates freely, leaving any attempt to subdue him in his extraterrestrial dust. Furthermore, the misfits of 3-E soon find that the strange, tentacled beast is more than just indomitable—he is the best teacher they have ever had! Adapted from the humorous hit manga by Yuusei Matsui, Ansatsu Kyoushitsu tells the story of these junior high pupils as they polish their assassination skills and grow in order to stand strong against the oppressive school system, their own life problems, and one day, Koro-sensei.

The second season of Ansatsu Kyoushitsu.

The students return as school is back in session for the second semester. Following their exploits on the island during summer vacation, Class 3-E continues to sharpen their blades with their sights set on their teacher, the slippery Koro-sensei. They have more to worry about than just their teacher, however, as enemy assassins, both old and new, are out for the increased bounty on the octopus' head. Moreover, their rivals in Class A, as well as Kunugigaoka Junior High's fearsome principal, stand to block Class E from achieving academic excellence. With all of these obstacles opposing them, the group must continue to work together in order to overcome their foes and accomplish their goal of successfully assassinating their teacher.

The story of the original manga begins after 70% of the moon was suddenly vaporized in an explosion. The super lifeform responsible for this catastrophe is a strange tentacled creature that can slink around at supersonic Mach 20 speeds. It has a 10 billion yen (US$100 million) price on its head, but for some reason, this creature ends up teaching a middle school class at the beginning of the school year. The students have until graduation to assassinate the teacher, or it will destroy Earth as well. The event anime special will adapt the original manga's popular segment about the field trip to ancient Kyoto.

A compilation film of the Ansatsu Kyoushitsu TV series, featuring anime-only epilogue scenes not originally in the manga.

A year can change a person's life forever. The 365 days Class 3-E of Kunugigaoka Junior High spent with their eccentric teacher, Koro-sensei, certainly did. Carrying the memories of that year close to their hearts, alumni Nagisa Shiota and Karma Akabane return to their former classroom to recall the events of that momentous time of their lives. Nagisa and Karma are reminded by the familiar rooms, desks, chalkboard, and the class album of the events that shaped them into "assassins" and prepared them for the real world. That is the legacy of their octopus-like teacher—who had introduced himself by threatening to destroy the world if they didn't kill him by the end of the school year—and the time spent in the bizarre yet exceptional "Assassination Classroom."

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One day, Tachibana, owner of the cake shop Antique, meets genius pâtissier Ono. He is Tachibana’s former classmate who used to get spurned by him. Tachibana is relieved to know that Ono doesn’t remember him, and so Tachibana invites him as a pâtissier at his cake shop. However, Ono has come out of the closet and makes numerous advance to Tachibana… more One day, Tachibana, owner of the cake shop Antique, meets genius pâtissier Ono. He is Tachibana’s former classmate who used to get spurned by him. Tachibana is relieved to know that Ono doesn’t remember him, and so Tachibana invites him as a pâtissier at his cake shop. However, Ono has come out of the closet and makes numerous advance to Tachibana.

The “heartwarming comedy” story poses the following premise: “What if you can really transform into an animal?” Riko, Rimu and Nagisa Mikogami are three cute sisters who live in Kamihama, a Japanese city abundant with natural wonders. On an otherwise peaceful day, the three come across a mysterious Kirumin compact in an attic. With the Kirumin, the… more The “heartwarming comedy” story poses the following premise: “What if you can really transform into an animal?” Riko, Rimu and Nagisa Mikogami are three cute sisters who live in Kamihama, a Japanese city abundant with natural wonders. On an otherwise peaceful day, the three come across a mysterious Kirumin compact in an attic. With the Kirumin, these character-costume-wearing girls can transform into real animals.

Ashito Aoi is a young, aspiring soccer player from a backwater town in Japan. His hopes of getting into a high school with a good soccer club are dashed when he causes an incident during a critical match for his team, which results in their loss and elimination from the tournament. Nevertheless, he catches the eye of someone important who happened to be visiting from Tokyo. How will things turn out for Ashito?

Ashito Aoi is a young, aspiring football player from a backwater town in Japan. His hopes of getting into a high school with a good football club are dashed when he causes an incident during a critical match for his team, which results in their loss and elimination from the tournament. Nevertheless, he catches the eye of someone important who happened to be visiting from Tokyo. How will things turn out for Ashito?