Kei is an infantry soldier in the Hi Shin Army as he is one of the oldest members of the army since their days as an 100-Man Unit. He comes from Jyouto Village and is a childhood friend of Shin, Hyou, Bi Hei and Bi Tou, and Kou.
He has long hair that is tied back in a ponytail.
Kei was raised by his grandmother. He's from the same village than Shin, Bi Hei and Bi Tou
During the Battle of Kankoku Pass he was seen struggling in a melee carrying a unconscious Kou with Bi Hei, Taku Kei and others of the infantry against the Man Goku Army and when they were about to die Den Yuu and Ka Ryo Ten saved them.