Watch Ansatsu Kyoushitsu OVA Online

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

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.

The second season of Ansatsu Kyoushitsu.

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.

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!