Aesthetica of a Rogue Hero

はぐれ勇者の鬼畜美学〈エステティカ〉

Akatsuki Ousawa returns from Alayzard, a sword-and-magic world where he defeated the Demon King Galious, and smuggles Galious's daughter Miu back to Earth posing as his sister. Both enroll in Babel, an international academy that trains young people who survived trips to other worlds in controlling their newly acquired abilities. Cocky and overpowered, Akatsuki dominates the academy while keeping Miu's true identity hidden from the authorities.