The main character of this work is Mayee Yamaguchi, who is active as a signboard actress in the small theater company ENGINE in Osaka. In preparation for the Tokyo performance, the members of the troupe are rehearsing for the performance "DICE", but they are plagued by mysterious strange phenomena that attack one after another. Believing that this would lead to an increase in the name recognition of the theater company, the theater company decided to make full use of TV programs and social media using the strange phenomenon.
The story takes place in a mega-corporation called Lumon, where a brand-new technology called amnesticomtomy is being experimented with, and employees who have undergone surgery will undergo personality separation surgery to form a corporate personality and an everyday personality. This bold experiment in "work-life balance" has been called into question. Employee Mark finds himself at the center of a mystery that forces him to confront the nature of his work and himself. In the second season, Mark and his friends learn about the terrible consequences of cutting their memories, setting them on an even more painful path.