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Retsumin KEI
Retsumin KEI is a martial artist who is also an assassin. He has black hair, a ponytail, and facial hair. He is muscular and is a very skilled fighter. He is a member of the Shinpaku Alliance and is one of Kenichi's friends. He is a very loyal and supportive friend and is always willing to help Kenichi in any way he can. He is also a very skilled teacher and has helped Kenichi to improve his martial arts skills.