Seikishi ni Natta kedo Danchou no Oppai ga Sugosugite Kokoro ga Kiyomerarenai

The aspiring sword master, Ruga, was chosen to join the Order of the Holy Knights due to his sincerity and swordsmanship prowess. He is assigned to the Sixth Order, rumored to be a "living hell," and prepares himself for tough times. However, he ends up meeting the big-breasted Commander, Leon Myrie, who says "Welcome, Ruga. You are the only male knight of the Sixth Order."
Looking at his right, he saw big breasts, at his left, beautiful women! Will Ruga's reason last in the face of this inescapable Order?