 This article is about an event in Kamen Rider Zi-O.
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Oma's Day (オーマの日, Ōma no Hi) refers to the fixed point in time that Sougo Tokiwa will become Kamen Rider Ohma Zi-O in the future.
The original unaltered timeline depicted Ohma Zi-O as an ironclad dictator in the year 2068 who ascended to godhood through the attainment of great power and destroyed humanity. Attempts were made in the past (or the present day) to prevent it from happening, resulting in the creation of a potential alternate future in which Ohma Zi-O had been defeated. Sougo's efforts to reverse the possible "GeizRevive future" brought back his own dark fate where he had obtained multiple new super forms as the date got closer to when his original evil conversion had occured. The day ultimately arrived as Sougo obtained the power to ascend to godhood, not through the intent to rule with iron will but to avenge his fallen comrades.
Erased 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]
Zi-O transforms into Ohma Zi-O
On April 17, 2019 in the original unaltered timeline where time travel had yet to occur, Sougo evolved from his base Zi-O form into the demonic Kamen Rider Ohma Zi-O, and eventually used his powers to wipe out all the Kamen Riders and at least 50% of the Earth's population. By 50 years in 2068, a human Resistance had been formed in order to combat against the might and terror of Ohma Zi-O's totalitarian dystopia. In this timeline, Geiz Myokoin and Tsukuyomi are members of the Resistance under a platoon led by Woz. After Woz had become a fanatic of the original Sougo Tokiwa and his rise to power, he followed Geiz and Tsukuyomi as they desperately went back in time to 2018 in order to stop a young Ohma Zi-O, a young Sougo Tokiwa from ever becoming the tyrannical king he is in their time.
This timeline was erased from existence during the events of Episodes 15 and 16 after the past Sougo lost his will to become king and temporarily stopped being Zi-O.
GeizRevive 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]
A vision of GeizRevive during Oma's Day.
This timeline was created in Episode 15 after Sougo witnessed the aftermath of the kinghood he aspired for by seeing 2068 with his own eyes. Having lost his will to become king, Sougo destroyed his Ziku Driver but was encouraged by Geiz to become a good king instead.
Zi-O II and Geiz battling each other as prophesied in Sougo's dream.
This created a diverging future where Zi-O dueled Geiz on April 17, 2019, and Geiz emerged victorious.[Another Zi-O 2019] He obtained the power of Kamen Rider GeizRevive and was hailed as the savior by the world.
It is from this timeline that White Woz became into being, and he describes this world to be "at peace, like time has stopped". Due to Sougo's prophetic dreaming of other Riders, they manifest into history as Shinobi, Quiz, and Kikai. At some point in the far future, Kamen Rider Ginga came into being.
This timeline was erased from existence during the events of Episode 30, which occurred on April 17, 2019.
Current Timelines[]
Zi-OTrinity during the first initial Oma's Day.
This timeline was created during the events of Episode 30, on the original prophesized date of April 17, 2019 where Sougo became Zi-O Trinity instead, a new super form that did not exist up until that point due to him reconciling his friendship with Geiz, affectively nulling the duel completely.[The Beginning of Everything 2009] [Our Goal 2019]
Remaining Ridewatches: Kiva, Kabuto, Agito, Drive, Den-O, and Hibiki
As the duel never occurred, White Woz and his future were erased from existence, allowing Ohma Zi-O's return to existence in the future. He sends a message to his younger self of this new timeline, informing him of the remaining Ridewatches he needs to collect in order to become Ohma Zi-O.
This timeline is temporarily disrupted during the events of Episode 41, in which Sougo's attempt to return to his time brought him to a timeline that was altered by his childhood enemy.
Disrupted Timeline[]
In this timeline, Zi-O II was defeated and his powers were siphoned from Hiryu Kakogawa, who would become Another Zi-O II. Ruling this world with his own iron fist, he worked with the Time Jackers who served as his advisors, and assisted with tasks such as capturing Tsukuyomi.
This timeline was erased during the events of Episode 43 after GrandZi-O from the current timeline arrived in this time to destroy Hiryu and his Another Rider army, allowing for the timeline in which Sougo originally came from before to be restored.
Restored Timelines[]
Due to various factors in which the events unfolded, it created two diverging timelines that ran parallel with one another, with characters in both timelines not interacting with one another.
After Hiryu's defeat, the current timeline was restored, though the Another Zi-O II watch now exists in this timeline and is in the possession of Daiki Kaito, who is able to use it and turn into Another Zi-O II himself.
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.
After Hiryu's defeat, Sougo follows Ohma Zi-O's advice of completing the GrandZi-O watch by faithfully obtaining Drive's without stealing it. He meets Go Shijima and Krim Steinbelt to obtain the Watch, but his kingship is challenged by his future self SOUGO Tokiwa. In this timeline, Ohma Zi-O helps him by granting a portion of his power to his younger self, allowing Sougo to become Zi-O Ohma Form.[Kamen Rider Zi-O: Over Quartzer]
Ohma Zi-O continues to exist, indicating that Sougo will still become him in the future through unknown circumstances.
[Kamen Rider Zi-O: Final Stage]Notes[]
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Ohma Zi-O in Rider Time
- Another variation of Ohma Zi-O is depicted during the events of both Rider Time: Decade VS Zi-O & Rider Time: Zi-O VS Decade, this one being the most power hungry than most other versions seen. Whether he is the same Ohma Zi-O from the TV show, originates from Sougo A's future, or a version of Ohma Zi-O from an A.R. World remains to be explained.