Samurai Ω to Akutoku Shachou

"Samurai teacher" Ryunosuke Yaken tends to be seen as an alpha because of his manly appearance and strength, but he's actually an omega. He used to be a kendo instructor at the dojo he inherited from his grandfather, but recently, due to the development of commercial facilities in the area, bad people frequently visit him. He was able to protect the dojo by splendidly defeating such people. However, one day, the boss, Masamune Otori, finally comes to the dojo...! ?