Ten years have passed since the tragic incident involving Sakiko and Renya, siblings caught in a complex web of circumstances that culminated in their mother's demise at the hands of a kidnapper. While Sakiko found herself confined to a psychiatric ward, Renya's whereabouts remained unknown, not even to the orphanage authorities. Meanwhile, a string of murders targeting women—particularly mothers—had gripped the community. And then there was you, mustering the courage to visit the abandoned house that once belonged to Sakiko and Renya's family.