Beryl Gardenant is a humble swordsmanship instructor who runs a dojo in a rural part of the Reberis Kingdom. Content with his simple life, he is oblivious to his own exceptional strength. However, his peaceful existence is disrupted when one of his former students, Alyushia, visits and recommends him for a special instructor position within the Knights. Reunited with his incredibly successful former disciples—a knight commander, a top-tier adventurer, the ace of the mage corps, and more—Beryl's life turns chaotic. He's evicted from his family dojo, inundated with requests beyond his role as an instructor, and constantly surrounded by these powerful individuals who admire him. Despite their affection, Beryl remains humble, unaware of his extraordinary talent. Surrounded by disciples who recognize his strength, he gradually reveals his abilities to the world, largely without realizing it himself.