Aoki Mizuki, also known as Mumu, suddenly discovered one day that his roommate Natsume Kuye, also known as Xiaome, disappeared in front of his eyes... One day after graduating from college, Mumu, like everyone else, had long forgotten the existence of Xiaome, but after a few special nights, Understanding the bond between herself and Xiaomu, taking "You are me, I am you" as an opportunity, from then on, the soul "Natsume Kuye" began the journey of realizing her wish... She met so many people who were similar to Dong Yueyin, and finally, the truth of the matter slowly came towards her...