A washed-up sword teacher gets dragged back into the world he left behind, except now his old students run the kingdom. The show knows exactly what it's doing with a protagonist who's genuinely skilled but completely content to have stopped wanting anything, then forces him to want something anyway. That tension between a man at peace and a world refusing to let him stay there is the whole thing.

Beryl Gardenant has run his father's sword dojo in a remote village for twenty years, long past his youthful dreams of glory and content to call himself a humble old man. That quiet life ends when Allucia, a former pupil who now commands the kingdom's knights, arrives with news that he has been appointed special instructor to the order. Pushed by his aging parents, Beryl reluctantly accepts and moves to the capital. There he meets more of his old students, now elite knights, a leading member of the Magic Corps and an adventurer holding the top guild rank. They are all eager for his teaching, though Beryl is sure they no longer need him. Soon rumors spread that even the strongest fighters cannot match the old man from the countryside. The result is a fantasy action comedy about a modest master who underestimates himself.