The stage is five years after "Borderless", Nao, Kiri, and Kotone have started a new life on their own. One day, a novel written by Kiri will be published under the name of a popular young actress. Kiri is dissatisfied but cannot resist. In addition, "incidents" occur to trace the incidents in the works. They can't believe it's a coincidence, who imitated what and why? As they tried to get to the bottom of the truth, an inescapable tragedy struck them again...
Psychology student Ozono Rei joined Keyakizaka46 through the Sakamichi Trainee program, and has been an addition to the group that's full of surprises; she made taking notes and counseling her fellow members (and even the show hosts!) in "Keyakitte, Kakenai?" her trademark, and at one point even had her own "Quote of The Day" segment. By the time the group transitioned into Sakurazaka, Rei surprised everyone yet again by becoming the first of the former trainees selected to be in the 1st single's main roster. She's cheerful, active, and compassionate; And it feels like her hard work always pays off. Just what other surprises could Rei have in store?