The drama tells the story of the life of Kida half a year after the ending of the film "Na mo Naki Sekai no End Roll".

Set half a year later of the main events, Kida receives a request to save a man from an organization. After learning the man requested help was a childhood friend, Kida accepts it. Around that time, Kida meets a mysterious woman Michiru. She tells him that "1 day is enough to change the world."