暗殺教室

A mysterious creature, capable of Mach 20 speeds, destroys most of the moon and threatens to annihilate Earth in a year unless stopped. This being becomes the homeroom teacher of Class 3-E at Kunugigaoka Junior High, tasking the students with assassinating him before the deadline. Nagisa Shiota, a quiet student with a knack for observation, and his classmates, each with unique skills, devise creative plans to kill their teacher, whom they nickname Koro-sensei. Despite his deadly reputation, Koro-sensei proves to be a caring educator, guiding the students in academics and assassination techniques. The class navigates school life, training, and their bizarre mission, forming unexpected bonds with their seemingly indestructible target. (Unreviewed summary by Grok 3)