Series by 白鳥士郎（GA文庫／SBクリエイティブ刊）

Yaichi Kuzuryu, a 16-year-old prodigy who became the youngest Ryuo, the highest title in professional shogi, is in a slump after his victory. Ai Hinatsuru, a nine-year-old elementary school girl, arrives at his doorstep, insisting he take her as his disciple based on a forgotten promise. Despite his initial confusion, Yaichi is impressed by Ai’s raw talent and agrees to mentor her, beginning an unexpected cohabitation. Ai’s earnest passion for shogi reignites Yaichi’s own drive, pushing him to confront his struggles. Their dynamic sets the stage for a comedic yet intense journey through the competitive shogi world, filled with rivalries and growth.