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Icon-zi-oThis article is about an event in Kamen Rider Zi-O.

"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]

Oma's Day (オーマの日, Ōma no Hi) 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[]

"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]
Zi-O transforms into Ohma Zi-O

Zi-O transforms into Ohma Zi-O

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.

"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.

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.[Happy New Woz 2019] 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[]

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 and Grand Zi-O[]

Zi-O 30

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

Ohma Zi-O displaying remain Ridewatches

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

  • 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!]
  • 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[]

Zi-OTrinity VS Ohma Zi-O

Zi-OTrinity squaring off against Ohma Zi-O

Ohma Zi-O 2019 Profile

Sougo Tokiwa transformed into Ohma Zi-O

  • 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.
  • 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[]

Icon-zi-o Kamen Rider Zi-O
Kamen Riders
Sougo Tokiwa (Over Quartzer) - Geiz Myokoin (Over Quartzer) - Woz (Black, Over Quartzer, White, Red) - Tsukuyomi (Over Quartzer)
Other Sougo Tokiwa variations
Ohma Zi-O - Sougo of 3 days later - Mirror World - B - C - D - E - F - Robot Sougo - True Sougo
Future Kamen Riders
2022 (Rentaro Kagura) - 2040 (Mondo Douan) - 2121 (Rento Makina) - Kamen Rider 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
Gear
Transformation Devices
Ziku-Driver - Ohma Zi-O Driver - Beyondriver - Miraidriver (Shinobi, Hattari, Quiz, Kikai, Ginga) - NeoDecadriver - NeoDiendriver - K-Touch21
Ridewatch-related
Ridewatches - Miridewatches- Ridewatch Holder - Ridewatch Daizer - Faizphone X - Taka Watchroid - Kodama Suika Arms
Weapons
Zikan Girade - Zikan Zax - Ride HeiSaber - Zikan Despear - Saikyo Girade - Zikan Jaclaw - Barlckxs' Sword
Vehicles
Ride Striker - Time Mazine - Dai Mazine
Others/Terminology
Rider Armors - Ohma 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 - Miss Sailor - Oda Nobunaga - Clara Steinbelt - Gyuzo - Pietro - Resistance Captain
Legend Riders
Kamen Rider: Takeshi Hongo
Kuuga: Yusuke Godai
Agito: Shoichi 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: Soji Tendo - Arata Kagami - So Yaguruma
THE FIRST/THE NEXT: Takeshi Hongo - Hayato Ichimonji - Shiro Kazami
Den-O: Ryotaro Nogami - Yuto Sakurai
Kiva: Wataru Kurenai - Jiro
Decade: Tsukasa Kadoya - Daiki Kaito - Yusuke Onodera - Natsumi Hikari
G: Goro
W: Philip & Shotaro Hidari - Ryu Terui
OOO: Eiji Hino - Michal Minato - Akira Date - Shintaro Goto
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 - Poppy Pipopapo - Masamune 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 - Is - Isamu Fuwa - Yua Yaiba - Jin - Horobi
Saber: Touma Kamiyama - Rintaro Shindo - Kento Fukamiya - Ryo Ogami - Ren Akamichi - Tetsuo Daishinji - Yuri - Reika Shindai - Ryoga Shindai
Revice: Sakura Igarashi - Hana Natsuki
Others
Chuta Ohsugi - Daita Kondou - Chikao Nezu - Hina Izumi - Shibuya Hachioji - Narita Kisarazu - Misora Isurugi - Fumen Master - Owner - Momotaros - Urataros - Kintaros - Ryutaros - Eri Ogawa - Daisuke Okubo - Amane Kurihara - Mana Kazaya - Riki - Ramon - Deneb - Krim Steinbelt - Takeshi Kinashi - Shesta - Jun Fukuzoe - Sanzo Yamashita - Narutaki - Akiko Narumi - Sawa Takigawa - Kanon Fukami - Lovekov
Time Jackers
Swartz - Heure - Ora
Movie Exclusive
Tid - Finis
Quartzer
Kamen Riders: SOUGO Tokiwa - Kagen - Jogen - Woz
Other Members: Q-YORI - Q-TOMO - Q-KIMI - Q-YEAH - Q-KENZO - Q-DAICHI
Another Riders
Another Build - Another Ex-Aid - Another Fourze - Another Faiz - Another Wizard - Another OOO - Another Gaim - Another Ghost - Another Double - Another Den-O - Another Kuuga - 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
Movie-exclusive Another Riders
Another Zero-One - Another 1 - Another Diend
Stageshow-exclusive Another Riders
Another Rider - No Rider - Another Ohma Zi-O
Novel-exclusive Another Riders
Another Ohma Zi-O Trinity - Another Tsukuyomi - Another Geiz - Another Woz
Other Villains
Kasshine - Genin - Humanoise - Worms - Elementary Inves - Trilobite Magia - Battle Magia
Black Satan
Mitsuko Fujimoto - Yuriko Kuroe - Devil Hana
Footsoldiers: Black Satan Soldiers
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