Saikyou Rakudai Kizoku No Kenma Kiwameshi Antou Tan summary:

The sword saint and the sage are in fact the underdogs of the school! A "one-man, three-role" substandard (dark) fantasy!Roy Revel is a frontier aristocrat from a lethargic small country. He is known as the "fallen aristocrat" at the school, but he has a secret. The strongest and most admired of the two great powers is in fact Roy, who plays the role of an incompetent! In order to protect his family, Roy, the strongest nobleman who manipulates the fight against the Empire from the shadows, is interested in the beautiful girls at the academy who aspire to become sword saints and sages.A new dark fantasy of the fallen aristocrat begins!