Oma's Day

refers to the fixed point in time that Sougo Tokiwa became Kamen Rider Ohma Zi-O in the future. Despite efforts to prevent it in the present day, several attempts in doing so had created diverging timelines, with each of them ultimately reaching the fateful event. 
==Erased Timelines==
On April 17, 2019 in the original timeline, Sougo evolved from his base form into the demonic Kamen Rider Ohma Zi-O, eventually using his powers to wipe out all the Kamen Riders and at least 50% of the Earth's population. By 2068, the Resistance was formed to combat against Ohma Zi-O's totalitarian dystopia, with Geiz and Tsukuyomi desperately going back to 2018 in order to alter this dire future. Woz had followed them through and entered into a feud with his alternate counterpart in an attempt to secure their own futures. This timeline was erased during the events of Episodes 15 and 16, after Sougo met his future self and temporarily stopped being Zi-O.
However as a result, it created a diverging future where Geiz would defeat Zi-O in the future and become known as Kamen Rider GeizRevive, the world's savior. From this potential future which was described to be "at peace, like time as stopped", White Woz traveled to January of 2019 to ensure that his timeline would pass while feuding with his prime counterpart. Due to this, new Kamen Riders are able to rise, such as Kamen Rider Shinobi, Kamen Rider Quiz, and Kamen Rider Kikai This timeline was erased during the events of Episode 30.
==Current Timeline==
Because of the multiple alterations to the timeline caused by several variables from the future, this event was pushed back several times, negating the above timelines and creating an entirely new one instead.
===The Duel Between Zi-O and Geiz Averted===
*Sougo destroyed his Ziku Driver after affirming his own future as Ohma Zi-O, but Geiz convinced him to try to become a good king instead. This created a divergent future where Zi-O was defeated by Geiz in a duel, later obtaining the power of GeizRevive as the world's savior. From this reality, White Woz traveled to the present day to make sure his future was set in stone.
*Sougo traveled to the Mirror World and overcomes the tormenting inflicted upon him by his Mirror World counterpart, granting him the power of Zi-O II. This allowed him to unconsciously have prophetic dreams of the future and make it reality, with one dream being the duel between him and Geiz, which resulted in his own loss that brought White Woz to their timeline. 
*Due to White Woz's interference from the future, Geiz had attained his GeizRevive form much earlier than prophesized, thus his continued over-usage of the form made him weaker to the point where he may not survive.
*By stealing the Kamen Rider Woz powers from White Woz to prevent him from fighting, Black Woz was able to use them and prevent the duel from happening instead. Tsukuyomi returned from the future and helped Sougo and Geiz reconcile, affectively nulling the duel completely. 
===Achieving Zi-OTrinity and Grand Zi-O===
*With his plan foiled and being unable to secure his own future, White Woz manipulated the Joker Undead out of hiding to restart the Battle Fight and destroy the world completely. 
*Sougo convinced White Woz to not give up fighting for his own beliefs and willingly drop his malicious plans, though the Battle Fight was still raging. Sougo combines his powers with Geiz and Woz, forming Zi-OTrinity in order to stop Another Blade and bring an end to the Battle Fight. As a result, White Woz was erased from existence and Oma's Day was pushed back.
*With his future as Ohma Zi-O revealed to still be intact, Sougo ventures on a journey to collect the six remaining Ridewatches and complete the GrandZi-O Ridewatch. Not knowing that a faithful acquisition of the Drive Watch was required, Sougo recklessly accepts Ohma Zi-O's challenge to a duel, allowing Hiryu Kakogawa to alter reality and jeopardize both of their existences. Sougo eventually returns to his timeline and defeats Hiryu.
===Path Towards Ohma Zi-O===
*Michal Minato is forced to intervene from 2050 to warn the team of their actions that are causing a , allowing the coming apocalypse they've been trying to prevent to happen.
*Swartz is successful in stealing Tsukasa Kadoya's powers. Using Another Decade's powers, he began to merge every single reality together, ultimately shattering the Ridewatches. This event brings the Drive Ridewatch from an alternate timeline to its prime.
*To break the time loop that created Ohma Zi-O, Sougo travels to 2068 and provides the "past" Tsukuyomi with her own Ridewatch, allowing her present-day self to become Kamen Rider Tsukuyomi. Using her new powers, she feigns loyalty to Swartz in order to discover his true intentions.
*Junichiro repairs the Ridewatches and Sougo enters his final showdown with Swartz. Geiz is killed in the process, triggering Sougo's transformation into Ohma Zi-O and marking this timeline's set date of Oma's Day. After Tsukuyomi is killed as well, Sougo mercilessly kills Swartz, later deciding to rewrite the world rather than rule it. At this point in time, the Ohma Zi-O from 2068 vanishes from existence as peace and stability is restored to the world.
==Notes==
To be added.
==References==
fr:Jour d'Ohma
Category:Events