Gomi Ika da to Tsuihousareta Shounin, Jitsu wa Zensei Kensha desu

The Servant Who Was Banished for Being Less Than Trash Is Actually a Sage in a Previous Life ~ The Most Powerful Sage in History Attends the World’s Most Prestigious Academy; ゴミ以下だと追放された使用人、実は前世賢者です ～史上最強の賢者、世界最高峰の学園に通う～