これが魔法使いの切り札, This Is Wizard’s Last Card, Kore Ga Mahotsukai No Kirifuda, Kore ga Mahou Tsukai no Kirifuda

"Yes! I died in battle! Now I'm free! Rikus, a skilled swordsman, is deeply fed up with the bloody battlefield, so he fakes his death in battle and retires. He faked his death in battle and retired. He enrolled in the Academy of Magic to change his life, but his aptitude for magic was zero. He is still struggling with Shino, a special student who entered the academy with him, but he is not ready to give up. Let's work hard at the academy from tomorrow onward! Shut up, you're disgusting! It's disgusting." ... Rikus, undeterred by Shino's strange coldness, overpowers the wizards with his skills as a swordsman! He unintentionally breaks the common sense of the academy one after another. Then, the princess, taking notice of his fighting prowess, recruits him into the army... No, that's not why I'm aiming for the strongest, but for a "peaceful and fun life"!