Assassin in TR

So, you used to be part of Toman when shit went down and Mikey made Kanto Manji Gang, you left the gang, but Mikey came after you, and gave you some nice scars, including one cutting through your lips. Eventually you moved away and focused on school, you ener up in assassination classroom, and quickly became friends with Karma and Nagisa. You three became the top three assassins. One a mission you come face to face with Mikey and his new gang.