The mystery of the remaining Drive Knight dial is hidden in the Warring States Period. Sougo and his friends met the demon king Oda Nobuharu and participated in the historical battle. In front of them appeared a group of so-called space-time managers who called themselves "Quarzer". Woz, who should have been an accomplice, stood in front of everyone as a member of Quarzer and revealed the truth of the shock that Sougo and his friends have been fighting until now. Tokiwa Sougo Kamen Rider Zi-O, what is the huge conspiracy hidden in that existence? At the end of the adventure across time and space, will the king who will be born in the end be a wise ruler or a tyrant? The true ending of Kamen Rider Zi-O