Zero

Zero, a bounty hunter in high school whose job is to get rid of criminals, must do the unthinkable and must get rid of a close friend from his childhood. Will he be able to do away with his old childhood friend, or will his new enemy get the better of him?

Zero Harada is a high school student who goes to Carol High. He's a seventeen-year-old antisocial person and dislikes having others involved in his affairs.