Kokona Asakura is the granddaughter of Asakura Kintoki, a renowned shogi master famous throughout Japan, and a highly skilled female professional player recognized by the league at a young age. Proud and arrogant, she looked down on amateur shogi classes—until she suffered a humiliating, crushing defeat at the hands of Head Instructor Kajuu. Burning with shame, Kokona challenges him again. Kajuu coldly tells her, "Come to my house tonight if you want a rematch," and walks away. Kokona knows she shouldn't go… but she does.