An official tweet from Ryuuou no Oshigoto!’s official Twitter account has revealed the additional cast for the anime.

Synopsis of the series:

“Yaichi Kuzuryuu is the youngest shogi champion in history—the ‘Ryuuou’.

And this is Ai Hinatsuru—a girl who asked him to become his disciple.Being too young for his title, Yaichi is going to revive his shogi through a passionate disciple…Wait, Ai-chan is 9 years old? She is an elementary school girl! And… is she going to live with Yaichi? All night until the morning? What? Officer, can we have you here, please! A comedy about shogi-holic live-in disciple.”