Hajime Kokonoi also called by the nickname Koko is the best friend of Seishu Inui. He is a member of the top administration of the Kanto Manji Gang. Prior to his membership in Kanto Manji, he was the 10th Generation Black Dragon Elite Guard Captain and later, a member of the First Division Tokyo Manji Gang. Koko once joined Tenjiku as its Treasurer. He is a sarcastic and over dramatic character which has always a funny remark in the right situation. He deeply cares for his friends.