The 16-year-old Kuzuryu Yaichi is the strongest professional shogi player in history, holding the title of "Dragon King", the highest honor in the shogi world. One day, a shogi-loving elementary school student named Hinazuru Ai appears in front of Yaichi and claims that Yaichi had promised to take her in as his apprentice, but Yaichi has no recollection of this. During his time with Ai, Yaichi not only discovers her amazing talent in shogi, but his own passion for professional shogi is also gradually rekindled.