Forty-seven Ronin
The story tells of a group of samurai who were left leaderless (becoming ronin) after their daimyo (lord) Asano Naganori had to kill himself by committing seppuku (ritual suicide). He had to do this because he assaulted a court official named Kira Yoshinaka. The ronin waited and planned almost two years, and then killed Kira to avenge their master's honour. They delivered Kira's head to Asano's grave. After that, the ronin had to kill themselves by committing seppuku as they had committed the crime of murder.