After waking up in the hospital, Tsubasa Ichinose learns that he and his family were in a car accident that has left them all suffering from amnesia. Despite not knowing anything about each other, Tsubasa and his family begin bonding as they explore the kind of family they must have been. However, upon returning home to a messy house filled with locked doors, it starts becoming clear that the idyllic family life they’d imagined couldn’t be further from the truth.