Oma's Day

The day of Ohma is an anticipated event in near future in Kamen Rider Zi-O. What exactly will happen on this day is different from timeline to timeline.

Oma Zi-O's timeline
On this day, Oma Zi-O controlled seven giant monstrous machines called Dai Mazines to destroy the world and become the "Demon King." This global catastrophe creates the timeline where Geiz Myoukouin, Tsukuyomi and the original Woz came from.

Geiz Revive's timeline
On this day, Geiz Revive defeated Oma Zi-O and saved the world, becoming its savior and creating a new history. Sometime after this day, Another Woz travelled to the current day to assist Geiz.