Playing Sister

In a distant future where rapid urban concentration of science and technology has left vast regions behind, Kagami Village—a secluded mountain settlement—persists under quiet isolation. A lingering folklore cautions: 'Behave yourself, or a Double will come for you.' Akane Higure, a middle school student living in Kagami Village, eagerly awaits the return of her elder sister, Sui Higure, who is finally being discharged from the hospital after a year-long stay. Yet soon after her sister comes home, Akane receives a single phone call: 'The girl at home with you… isn’t your sister.'