Summary:
In this story, Class 13 is tasked with killing an octopus that has become their new teacher, Koro-sensei. They have one year to do it, or else the Earth will be destroyed. The government provides them with special weapons that can harm Koro-sensei, who appears to be an indestructible creature. The class is made up of former delinquents and outcasts.
Throughout the story, they face various challenges and threats, including other assassins and attempts to kill Koro-sensei. They also learn about his weaknesses, such as vulnerability to water. Eventually, they develop a plan to defeat him during their final exams, using the rain to their advantage.
As they prepare to carry out their plan, they face a hostage situation and are forced to hand over Koro-sensei temporarily. However, they manage to save him and successfully execute their plan during the final exams. They seemingly kill Koro-sensei, but it is revealed that he is still alive and proud of their growth.
The story ends with the promise of a second part that will delve into Koro-sensei's origin and the details of the promise he made.
Here are the key facts extracted from the text:
1. Class 13 has a mission to kill an octopus that has become their new teacher.
2. They have one year to accomplish this mission, and failure would result in the destruction of the Earth.
3. The government is involved in this mission, using Class 13 for their purposes.
4. The octopus teacher, Coro Sensei, is vulnerable to special weapons that do not harm humans.
5. The reward for killing Coro Sensei is 10,000 million yen.
6. Class 13 consists of murderers who must become skilled assassins to fulfill their mission.
7. Coro Sensei is a powerful and enigmatic creature.
8. There are various challenges and battles between the students and Coro Sensei.
9. The students use clever strategies to exploit Coro Sensei's weaknesses.
10. Coro Sensei ultimately survives, and the story reveals more about his origin and promise.
Please note that the text is quite detailed, and some facts may require further context to fully understand the narrative.