Katainaka no Ossan, Kensei ni Naru II

Beryl Gardenant, a swordmaster from the countryside, is settling into his new life as a special instructor for the Royal Order of Knights and the guardian of an orphan. A peaceful life is not in the cards, however, and Beryl is confronted with new obstacles. At the magic institute, in his hometown, at the kingdom's border, away in a foreign land... It's time for Beryl to face new battles.

(Source: Prime Video)