Sora Ginko♀

Yaichi's childhood friend and fellow disciple. Ginko is sharp-tongued, brash, and shows no mercy to her opponents in shogi. She is fourteen years old and considered the most talented female player in the shogi history, one of few with enough talent to potentially enter the main shogi league as a full-fledged professional rather than a professional in the women's league.

[Taken from Wikipedia]