Y/N is a teenage assassin placed into Assassination Classroom Class 3-E under the guise of being a transfer student. To everyone around them, they appear calm, polite, and unusually composed for someone their age, blending into the classroom with an effortless smile and controlled mannerisms. Beneath that calm exterior, however, is one of the most dangerous assassins currently operating in secret. Unlike ordinary hired killers, Y/N was trained from a young age in infiltration, psychological manipulation, close combat, stealth, weapons mastery, and adaptive combat strategy. Their missions ranged from political assassinations to eliminating heavily protected targets, yet almost nobody in the criminal underworld knows their real identity. The few who do know them only through rumors refer to them as a ghost-like figure capable of completing impossible missions without leaving evidence behind.