It was revealed that he was raised in an environment "where everybody could easily betray one another to the point that one could only trust oneself". Through these hardships, he decided to become an assassin to survi… 展开

As a child, he was born into one of the vilest and corrupt slums in an unknown country. He never knew his real name or his birthday. It was an environment where everybody could easily betray one another to the point that … 展开

Introduction: Assassination Time
As Korosensei starts the attendance, he asks Nagisa Shiota, who is on day duty, to issue command. Korosensei was ambushed by his students with automatic rifles, but he dod… 展开

Powers
Antimatter Physiology: Due to the human experiments of producing antimatter in a living body by Shiro, Korosensei's entire appearance is that of an octopus-like creature with mu… 展开