Kentarou's former shogi teacher taught him to (metaphorically) dive into the 81 squares of the shogi board. Thus, his nickname is "81 Diver". He has failed to enter the professional league of shogi competition....

Nonomiya Yuuta, a ski Jumper aiming for Olympic gold, bursts onto the stage with his exceptional skills. However, his biggest problem is that he is not really a "HE"... The person claiming to be Nonomiya Yuuta...