When Tomomi was young, her older sister Setsuna transferred to Star Galaxy Academy for girls who want to me Idols-in-training. Tomomi starts to dream to become and Idol as she starts wishing to surpass her older sister in the Galaxy Queen Cup Festival. When auditioning to become a student at Star Galaxy Academy six years ago, Tomomi forgets about her older sister, saying she was there to pass her older sister and a powerful force comes to the Academy to shed light on who the Galaxy Queen really is and why she was chosen.