Shibata Yokusaru manga
Kentarō's former shogi teacher taught him to (metaphorically) dive into the 81 squares of the shogi board. Thus, his nickname is "81diver". He has failed to enter the professional league of shogi competition. However, he continues to play the game for a living by gambling at amateur shogi clubs.
By day, highschool girl Aikawa Maki is a normal girl who has fun with her classmates Yuu, Michiru, Renge and Mina. By night however, where streetfights take place, she becomes an unrivaled lethal air-borne attacks user with a succession of victories: Airmaster. Various strong people, fascinated by this girl's strength, will come to challenge her in battle...this vivid street-fighting comic starts here!!!