Sixteen-year-old Kosome is the eldest daughter of a legendary entertainment family. Her younger brother Tokiwo is a famous actor, and her younger sister Koma is a top idol. Yet Kosome herself is the one ordinary child in the household—average grades, no stage presence, and no apparent gift for performing. Doted on by her siblings, she works a humble part-time job at the family’s talent agency, keeping a low profile. But Kosome harbors a hidden, extraordinary ability that sets her apart from everyone else. When that talent is finally noticed, she is pulled into the dazzling, cutthroat world of show business, forced to carve out her own identity amid the shadows of her famous family. The story follows her journey as she confronts jealousy, pressure, and the question of what it truly means to shine, while her siblings’ protective love both shields and complicates her path.