Star-link, a high school idol group will leave their school life to a performance that they will never forget. The prom night that would fill them with beautiful memories suddenly took an abrupt turn when a light hit them. They’re transported into Stellarium, an unimaginable fantasy world. The incident leads them to meet the heroes that will guide them on an adventure to fight a mysterious enemy so they can return back to Earth. By undertaking this adventures they will soon learn that they aren’t just ordinary girls!