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.

[Source: Anime News Network]

Koro-sensei reminisces about his first meeting with Karasuma, where they first butted heads and fought against each other, ultimately coming to respect one another. However, Karasuma eventually points out their actual meeting wasn't nearly as eventful.

[Source: Anime News Network]

A humorous and action-packed story about a class of misfits who are trying to kill their new teacher – an alien octopus with bizarre powers and super strength! The teacher has just destroyed the moon and is threatening to destroy the earth – unless his students can destroy him first. What makes things more complicated is that he's the best teacher they've ever had!

[Source: VIZ]

A humorous and action-packed story about a class of misfits who are trying to kill their new teacher – an alien octopus with bizarre powers and super strength! The teacher has just destroyed the moon and is threatening to destroy the earth – unless his students can destroy him first. What makes things more complicated is that he's the best teacher they've ever had!

[Source: Viz]

Unaired short episodes.

Unaired short episodes.

The killer class is back in session—sort of. Relive every moment that made you laugh, cry, and kept you on the edge through the eyes of the top two students: Nagisa and Karma. Reminisce with them about the time spent in Class 3-E from the moment Koro Sensei appeared to his final moments. This is a look back at the adventures of being assassins in training!

[Source: Funimation]

Get ready for a strange but fun-filled adventure with your favorite group of assassins. The killer class is back but this time they’ve got…magic?! In this brand new spin-off series, follow the chibis of Class 3-E as they learn swordsmanship and sorcery at Kunugigaoka Magic School. Their mission? Defeat the evil Demon King Koro Sensei and face the trials and perils of their magical school!

[Source: Crunchyroll]