Katainaka no Ossan, Kensei ni Naru

For twenty years, Beryl Gardenant has taught swordsmanship in a remote village, long convinced that whatever dreams of greatness he once had belong to the past. His former pupils disagree. When Allucia Citrus, now commander of the kingdom's knights, returns with an order appointing him their special instructor, Beryl is pulled from his quiet dojo and sent to the capital.

There he reunites with students who have become elite knights, renowned adventurers, and gifted mages, all of whom still regard him as the master who shaped them. Beryl keeps insisting that he is only an aging country swordsman, but the capital soon begins to see what his pupils have known for years: the modest instructor from the backwater village may be far more formidable than he realizes.