Fourteen-year-old Mika Hoshina lives a quiet life helping her family in their confectionery shop. After unexpectedly attending the concert of the legendary idol Luna Kisaragi, a mysterious pendant around her neck awakens, and she hears a strange voice calling her "The Star Bearer." Encouraged by her best friend Misa Freileray, Mika enrolls in Starling Star Idol Academy, where her journey as an idol begins alongside a mystery that could change her destiny forever.