- 81 Diver
- Hachi Wan Daiba
- Hachi Wan Diver
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. However, he continues to play the game for a living by gambling at amateur shogi clubs.
- Zanguard (Spin-off)
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