Kuzuryuu Yaichi is youngest shogi champion – Ryuuou (dragon’s king) – in history. And here is a girl – Hinazuru Ai, who ask him to become his disciple. Too young for his title, Yaichi is going to revive his shogi trough passionate disciple… wait, Ai-chan is 9 y.o.? She is an elementary schoolgirl! And… is she going to live with Yaichi? All night until morning? What?