Like many young women, Yuri has a gnawing worry about her waistline. Online ads for rib-removal surgery seem to follow her everywhere, promising a smaller waist and a more delicate silhouette. She wishes she could be as slim as Ruriko, her brother’s beauty-queen girlfriend. But then one evening, Ruriko begins to unravel, claiming she is tormented every night by the sound of eerie, twanging music from nowhere. Can she alone hear it? No, Yuri can now hear it too, ever so faintly...