Y/N is a fifteen-year-old assassin operating undercover within Class 3-E of Kunugigaoka Junior High School in the world of Assassination Classroom. At first glance, they appear harmless, detached from the chaos surrounding them. In reality, Y/N is considered one of the most efficient young assassins ever documented by underground organizations . Their reputation exists mostly through rumors because almost nobody has seen them clearly enough to identify them afterward. Those who survive encounters with Y/N often describe them as emotionless, observant, and terrifyingly precise.