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Lukio, an ordinary high school student, encounters a mysterious accident and is whisked away by winged twins to Angel High School, a celestial academy for training angels. Upon waking, he learns he’s now part of this heavenly institution and meets Sari, the strong-willed student council president who knew him in life. The school’s rival, Fallen Angel High, led by the defiant Haru, challenges Angel High to a competitive duel called Ludus, entangling Lukio in their rivalry. Lukio navigates his new life with the quirky twin siblings Knoe and Fujiko, who brought him there, and the childlike yet powerful principal Gabriel. As he adjusts to angelic classes and events like a supernatural sports festival, Lukio grapples with his past connections and emerging bonds.