Only the people who have been into Human Experimentation have resurrected their memories of the Old World in the Sento Kiryuu's (Kamen Rider Build) New World. In the New World there were people who are planning to rule the world using the power of science as a Weapon. Their name is Downfall. These are the terrorist group who are planning to make use of Rider System.
Zi-O Episode 35, 36 & 37 Episode Guide: Explanation to Why Both Another Rider & Original Rider Existed Together
Kamen Rider Zi-O Episode 35
Air Date - May 12
Screenplay - Toshiki Inoue
Director - Naoki Tamura
Sougo Tokiwa transforms into Kamen Rider Zi-O when he sees a person getting attacked by Another Kiva. The identity of Another Kiva was Youku Kitajima who had been sentenced to jail for murder. The one whom she attached was her lawyer.
The ending of Kamen Rider Brain had revealed that Gou Shijima (Kamen Rider Mach) was working on some Project called Neo Core-Driviars for Kamen Rider. He was seen reviving Heart, Medic, Brain & also Chase through available data. Proto Zero was also seen there.
Kamen Rider Zi-O Kiva Part's Trailer was released a day early this evening. The trailer is for both Episode 35 & Episode 36. The title for Episode 35 is "2008: First Love, Wakeup!" which will air on May 12 & Episode 36 will air on Episode 36.