Aesthetica of a Rogue Hero

For thirty years, thousands have ventured to other worlds. Those who return keep the powers they wielded there. Akatsuki Ousawa returns from the world of Alayzard with the defeated Demon King's daughter, Miu. Miu pretends to be Akatsuki's sister to conceal her true identity. They join Babel, a school for inter-dimensional travelers, and struggle against the student council to uncover the truth behind the school.