Shii Hayama, a 27-year-old office worker, is employed at an advertising agency and follows a monotonous routine of hard work and returning home on the last train, One day, after dozing off on the train, she awakens to find herself next to Azusa Kamiya. To her surprise, Azusa has recently moved into the Adjacent apartment. Despite it being their first encounter, Azusa seems familiar with every detail of Shii's body. This strange phenomenon is a re more.. sult of Azusa's remarkable secret..!