In the year 2032, the beloved idol unit "7th Sisters" suddenly vanished, leading to the downfall of the entire industry. Fast forward two years later, a tenacious young employee is appointed as the leader of Tokyo's emerging idol studio known as "777" or "Nanastar". However, the city has labeled idols as outdated, causing Nanastar to face an uphill battle. But, their destiny takes a turn when a gorgeous and enigmatic female manager proposes a plan. "Let's create new idols that are authentic 'sisters' bound by unbreakable connections!" Thus begins the thrilling story of the Nanastar Sisters- the idols of the future, eagerly awaiting their birth.