Gakusen Toshi Asterisk is set in a world transformed by a cataclysmic event, leading to the rise of individuals with extraordinary powers called Genestella.
These Genestella attend specialized academies and compete in duels called Festas.
Ayato Amagiri, a new transfer student at Seidoukan Academy, finds himself entangled in the world of Festas after an unfortunate encounter with Julis-Alexia von Riessfeld.
While seemingly uninterested in the Festas, Ayato has a hidden agenda: to find his missing sister.
As he navigates the challenges of the academy and its talented students, a larger conspiracy unfolds, forcing Ayato to fight for his own reasons and against formidable opponents.