Hisaya Miki (三木 久也, Miki Hisaya) is a freshman at St. Ishiyama High School, and a member of the Six Horsemen- or the Rokkisei . He was once a friend of Oga and Furuichi, who went to their middle school. He was friends with Oga, as he looked up to his strength and wished to be strong as well. After sometime he had to move to Nara, leaving with a burning hatred for Oga.