Explore the fantastic futuristic metropolis of Academy City, where the most brilliant minds are building the first space elevator in the world. This towering pillar will soon be able to transport people into the cosmos. Meanwhile, luckless Kamijo and future nun, Index, meet a street singer named Arisa who is on the cusp of fame when she lands her big break. Unfortunately, her beautiful voice makes Arisa a target and she must now rely on her new friends to keep her safe in an epic battle that takes place high in the heavens.