Sougo Tokiwa, a high school student born in the year 2000, has always dreamed of becoming a king when he encounters a mysterious girl named Tsukuyomi, who hails from the future in a desperate effort to alter her dire future. She presents Sougo with an ominous warning "You will become the king of all time, Kamen Rider Zi-O, a demonic king destined to rule the world.”. Sougo takes up the mantle as Kamen Rider Zi-O to stop the Time Jackers from destroying the very fabric of space-time while protecting the legacy of the Heisei Kamen Riders that came before him. During his journey alongside Geiz Myokoin, a Kamen Rider from Tsukuyomi's future, and the mysterious prophet Woz who reminds Sougo of his demonic destiny, they will meet their esteemed predecessors, who they must gain their trust and powers in order to create a new future for the Kamen Riders and mankind itself. This is the story of a Kamen Rider who would be king, who will fight to save the past, present, and future, encountering the various Heisei Kamen Riders throughout space-time. [Source: Kamen Rider Wiki]