Suzu, a 17-year-old high school student, is raised by her father and can't come to terms with her mother's early death. Since she and her mother used to sing together, Suzu has since given up singing, but has started writing songs. The girl decides that in the virtual space U, where there are 5 billion users, she will become a different person, and creates a complete opposite - a beautiful singer named Belle. In this new reality, the girl quickly becomes popular and gains millions of fans. One day her virtual concert is disrupted by a mysterious user in the form of a dragon, and Suzu decides to find out who he really is.