Mukan no Kishi, Youjo ni Tensei suru

A professional Shogi player in his 40s who has never won a championship is reborn as a young girl in shock after losing to a young prodigy called "Maou" in the Meijin Tournament! She is called "Sakura" and has a twin "Ouka" by her side. Sakura, who has an unquenchable thirst for Shogi and vows to take revenge on the "Demon King," discovers the talent of "Ouka"! This is a reincarnation-style Shogi manga.