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This article is about a/an event in Kamen Rider Zi-O.
Zi-O Timeline

Oma's Day

"Oma's Day! The day of judgment marking the end of the Kamen Rider era. Is it the end of history or just the beginning? Choose our future!"
―Opening narration (episodes 17-29)[src]

Throughout the series, it had been established from the very beginning that Sougo Tokiwa will inevitably become Kamen Rider Ohma Zi-O, which that day will be known as Oma's Day (オーマの日 Ōma no Hi), alternatively spelled as Oma's Day. While several efforts had been made in an attempt to prevent this fateful day from happening, it only delayed the event and created several different timelines in the space-time continuum, each with its own version on how it happened.

Negated Timelines

Original Timeline

"Sometime in the future, an event known as Oma's Day happens. On that day, you became Ohma Zi-O and all the Riders aside from you disappear."
―Geiz explaining Oma's Day to Sougo[src]
ZiO to Ohma

Zi-O transforms into Ohma Zi-O

In the original timeline, on April 17, 2019, Sougo Tokiwa obtained the Zi-O II Ridewatch and 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. However, Woz followed them through in an effort to stop them, although he later enters a feud against his white counterpart in an attempt to secure their own futures.

GeizRevive's Timeline

"On the upcoming Oma's Day, you will destroy Ohma Zi-O, and become the one to change history!"
―White Woz revealing the newly diverged Oma's Day to Geiz and Sougo[src]
Geiz Revive vision

A vision of GeizRevive during Oma's Day.

Due to the present day Zi-O temporarily giving up his Ziku-Driver, it created a diverging future where Geiz defeated Zi-O and became known as Kamen Rider GeizRevive, the world's savior. From this future, White Woz traveled to January of 2019 to ensure that this timeline is set in stone, eventually entering a feud with his black counterpart to secure their timelines. Happy New Woz 2019 Due to this, new Kamen Riders are able to rise, as such Kamen Rider Quiz in 2040. White Woz describes this timeline to be "at peace, like time itself has stopped". Mirror World 2019

It is never explicitly stated whether Sougo is alive or not in this timeline.

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

Oma Day prophetic dream

Zi-O II and Geiz battling each other as prophesied in Sougo's dream.

  • 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. Another Zi-O 2019
  • 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. The Beginning of Everything 2009 Our Goal 2019

Achieving Zi-OTrinity

Let's TRINITY

Zi-OTrinity during the first initial Oma's Day.

  • 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. Blade Joker!? 2019
  • 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.2019: Trinity Has Begun!

The Path Towards GrandZi-O and Beyond

Oma Zi-O shows Sougo a Kiva Ridewatch, Kabuto Ridewatch, Agito Ridewatch, Drive Ridewatch, Den-O Ridewatch and Hibiki Ridewatch

Remaining Ridewatches: Kiva, Kabuto, Agito, Drive, Den-O, and Hibiki

  • 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. Knowing he did not faithfully have the Drive Watch, Sougo recklessly challenges Ohma Zi-O to a duel in 2068, which allowed Hiryu Kakogawa to jeopardize both of their existences by altering reality in 2019.
  • Michal Minato is forced to intervene from 2050 to warn the team of their actions that are causing a temporal loop, allowing the coming apocalypse they've been trying to prevent to happen.

The Path Towards Ohma Zi-O

Zi-O Oma VS Barlckxs

Zi-O Ohma Form fighting Barlckxs

Trinity VS Oma

Zi-OTrinity squaring off against Ohma Zi-O

Sougo Oma tab

Sougo Tokiwa transformed into Ohma Zi-O

  • In the midst of the temporal disruption, 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.
    • The team met with Go Shijima and Krim Steinbelt to acquire the Drive and Mach Ridewatches, and faced Quartzer where they learn of Black Woz's true origins. After Sougo attained Ohma Form, Geiz and Tsukuyomi were erased from existence. However because of Swartz's merger in the true timeline, the two are revived and Ohma Form is erased from existence instead.
  • 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. 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

Sougo Tokiwa (Ohma Zi-O, Mirror World, Leader of Quartzer) - Geiz Myokoin - Woz (black, white, red) - Tsukuyomi
Future Kamen Riders
2022: Rentaro Kagura - Isamichi Konjo
2040: Mondo Douan
2121: Rento Makina
Ginga
Rider Time Ryuki Riders
Ishihashi - Tozuka - Kimura - Ishida - Abyss - Odin
Another World Riders
G4 - Fuma - Dark Ghost - Rey - Katsumi Daido - White Woz - Yuuki
Other Riders
G3 Team - Shun Kageyama (Worm)
Movie-exclusive Riders
SOUGO Tokiwa - Kagen - Jogen - Soreo Hiden
Stageshow-exclusive Riders
Hiryu Kakogawa - Red Woz
Ziku-Driver - Ohma Zi-O Driver - Ridewatches - BeyonDriver - Mirai Driver (Shinobi, Hattari, Quiz, Kikai, Ginga) - Zikan Girade - Zikan Zax - Ride HeiSaber - Zikan Despear - Saikyo Girade - Zikan Jaclaw - Faizphone X - Taka Watchroid - Kodama Suika Arms - Ride Striker - Time Mazine - Dai Mazine - Kurogane Oogama - Giant Wasp Mecha - Neo Decadriver - Neo Diendriver - Barlckxs' Sword - Zamonas' Bowgun
Others/Terminology
Rider Armors - Ridewatch Holder - Ridewatch Daizer - Oma Advent Calendar - Future Note - Time Finishers
Allies
9 5 DO: Geiz Myokoin - Tsukuyomi - Junichiro Tokiwa
Others
Futaros - Ataru Hisanaga - Shingo Hisanaga - Iroha Kagura - Master Gamano - Sara - Ms. Sailor - Oda Nobunaga - Clara Steinbelt - Gyuzo - Pietro
Resistance: Resistance Captain
Kuuga: Yusuke Godai
Agito: Shouichi Tsugami - Takahiro Omuro
Ryuki: Shinji Kido - Dark Shinji - Ren Akiyama - Takeshi Asakura - Miyuki Tezuka - Jun Shibaura - Goro Yura
555: Takumi Inui - Masato Kusaka
Blade: Kazuma Kenzaki - Hajime Aikawa
Hibiki: Hitoshi Hidaka - Tomizo Todayama - Kyosuke Kiriya
Kabuto: Souji Tendou - Arata Kagami - Sou Yaguruma
THE FIRST/THE NEXT: Takeshi Hongo - Katsuhiko Yano - Shiro Kazami
Den-O: Ryotaro Nogami - Yuto Sakurai
Kiva: Wataru Kurenai - Jiro
Decade: Tsukasa Kadoya - Daiki Kaito
G: Goro
W: Philip & Shotaro Hidari - Ryu Terui
OOO: Eiji Hino - Michal Minato - Akira Date
Fourze: Gentaro Kisaragi
Wizard: Haruto Soma - Kosuke Nitoh
Gaim: Kouta Kazuraba - Kaito Kumon - Takatora Kureshima
Drive: Shinnosuke Tomari - Go Shijima - Chase - Brain
Ghost: Takeru Tenkuji - Makoto Fukami
Kuuga (manga): Yusuke Godai
Amazons: Haruka Mizusawa - Jin Takayama
Ex-Aid: Emu Hojo - Hiiro Kagami - Kiriya Kujo - Kuroto Dan
Kamen Sentai Gorider: Aka-Rider - Ao-Rider - Ki-Rider - Momo-Rider - Mido-Rider
Build: Sento Kiryu - Ryuga Banjo - Kazumi Sawatari - Gentoku Himuro - Evolto
Zero-One: Aruto Hiden - Isamu Fuwa - Yua Yaiba - Horobi - Jin
Others
Chuta Ohsugi - Daita Kondou - Chikao Nezu - Hina Izumi - Shibuya Hachioji - Narita Kisarazu - Misora Isurugi - Master of Fumen - Owner - Momotaros - Urataros - Kintaros - Ryutaros - Daisuke Okubo - Amane Kurihara - Mana Kazaya - Riki - Ramon - Deneb - Krim Steinbelt - Takeshi Kinashi - Izu
Swartz - Heure - Ora
Movie Exclusive
Tid - Finis
SOUGO Tokiwa - Kagen - Jogen - Woz
Another Build - Another Ex-Aid - Another Fourze - Another Faiz - Another Wizard - Another OOO - Another Gaim - Another Den-O - Another Double - Another Kuuga - Another Ghost - Another Shinobi - Another Quiz - Another Ryuga - Another Kikai - Another Zi-O (II) - Another Ryuki - Another Blade - Another Agito (troops) - Another Hibiki - Another Kiva - Another Kabuto - Another Drive - Another Decade - Another Diend - Another Zero-One - Another 1
Stageshow-exclusive Another Riders
Another Rider - No Rider - Another Ohma Zi-O
Other Villains
Kasshine - Humanoise - Yaminin - Dustards - Worms - Trilobite Magia
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