"Samon Syndrome" was discovered 30 years ago, leading thousands of young people to venture into fantasy worlds. Only a handful successfully come back with unique skills from alternative realms. Akatsuki Ousawa, the "Rogue Hero," leaves behind serenity in the Alayzard fiction world to confront fresh obstacles in his return to earth with Miu, daughter of the defeated Demon King. To protect her true identity, Akatsuki poses Miu as his sibling. Together they enroll in Babel, a school that targets individuals who have gained special abilities and magic powers from their travels to parallel universes. Although Babel claims to guide these interdimensional explorers "to the right path for the sake of humanity and themselves," its intentions remain veiled to Akatsuki and Miu. Can they withstand the influential and contentious student council and unravel the behind-the-scenes plot?