For 30 years, thousands have traveled to other worlds. The few that return keep the powers they had in those worlds. Akatsuki Ousawa returns from the world of Alayzard with the defeated Demon King's daughter, Miu. Miu pretends to be Akatsuki's sister to hide 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.
Episode 1
Having vanquished the Demon Lord Garius, Akatsuki Ousawa bids farewell to the world of Alazyard and returns to his home world. His epic adventure has actually only just begun, though…
Episode 2
Akatsuki and Miu attend their first day of school at BABEL. While Miu tries to fit in with her new environment, Akatsuki manages to get on everyone’s bad side.
Episode 3
Because of Akatsuki’s antics, the student council has threatened to send Kuzuha back to elementary school unless she spies on him. Meanwhile, Onizuka hatches a plan to get back at Akatsuki.
Episode 4
Akatsuki uses his newfound sword to battle the powered-up Cockatrice. Meanwhile, Miu starts to come to terms with her father’s death and powerful COCOON members hold a secret meeting.
Episode 5
Miu visits a shopping mall for the very first time to buy some new underwear. But hijinks ensue when Akatsuki gets a little more involved than he should…
Episode 6
Akatsuki attempts to ride the fabled Sleipnir motorcycle. Meanwhile, terrorists strike in the heart of the city, and it’s up to the student council to stop them.
Episode 7
While Akatsuki and friends participate in a game of Beach Swimsuit Tag, powerful figures in Alayzard hatch a plan to find and retrieve Miu.
Episode 8
As the school-wide ranking battles begin, all eyes are focused on Akatsuki and Miu. Even Kyoya and the student council are eager to show Akatsuki who’s boss!
Episode 9
After the BABEL ranking matches are suddenly thrown into chaos, Phil Burnett arrives from Alayzard to retrieve Miu.
Episode 10
In the fantasy world of Arezard, the rogue hero Akatsuki — at the request of the defeated Demon King — agrees to protect his fallen enemy’s daughter, Miu, and return with her to the world from which he came.
Episode 11
Having been outclassed by Akatsuki, Phil uses his trump card and transforms into a giant dragon! Akatsuki’s friends and the student council members struggle to buy time until Akatsuki can fully recover from Phil’s poison.
Episode 12
Akatsuki and Miu face off with Zahhak in a final battle. Meanwhile, the truth behind Phil is revealed in Alayzard and COCOON takes further notice of Akatsuki.
