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MMukuro Rokudo is a 15-year-old Mafia criminal who escaped from an Italian prison, which held some of the most dangerous Mafia criminals, before he was to be executed. Not long after, he, along with his two subordinates, came to Japan, enrolled in Kokuyo Junior High, and started the Kokuyo Gang, which consists of heinous criminals whom have recently escaped from prison.Skilled in casting illusions as well as mind control, He attempts to take his revenge on the Mafia by taking over Tsuna's body and using him to wreak havoc. When his plan fails due to Tsuna's interference, he is once again imprisoned.

Source from Wikipeida