S1, E1: Having vanquished the Demon King Garius, Akatsuki Ousawa bids farewell to the world of Alayzard and returns to his home world. He brings with him Miu, the busty daughter of the dark lord, who must pretend to be his long-lost sister. The two enrol at Babel, an academy for students with special powers, and find the adventures are just beginning.