A group of archaeologists open a tomb that awakens horrible monsters, while journeyman Yusuke Godai is compelled to access a strange belt from the tomb to fight back against them.
A drunkard witnessed a murder by an Unidentified Lifeform near a Church. Meanwhile, Yusuke is bothered by the idea of fighting and is unsure if it was right until he saw the daughter of one of the slain archeologists crying.
Yusuke Godai leaves the message, "I've returned to Tokyo because of some important business. But I will return tonight."
As #5 continues to rampage with her speed through Tokyo, Ichijou must come to a decision regarding whether to work alongside Yusuke.
Through his combination with Detective Ichijo, Yusuke Godai a.k.a. Kuuga is victorious over the Unidentified Lifeform #5, Zu-Mebio-Da.
In the battle against Unidentified Lifeform #6, Zu-Batsu-Ba, who had been appearing frequently in the Suginami ward, Kuuga's body changed from red to blue...
Three months have passed since the series of events with the Unidentified Lifeforms broke out.
During the battle with the bee-type monster Me-Badjisu-Ba that approaches from the sky, Kuuga's body changes from blue to green.
At the combined investigation headquarters of Ichijo and other detectives they've confirmed from their investigation so far that the Unidentified Lifeforms have a habit of gathering in one location
Kuuga fights the squid-type monster Me-Giiga-Gi but his attacks are absorbed by the monster's pliant body and he suffers its counterblows, leaving him in critical danger.
It's March 25th. For the sake of a promise, Yusuke heads to his old elementary school.
Kuuga winds up in a dire situation after taking the fierce attacks of Unidentified Lifeform #22, the rhino-type monster Zu-Zain-Da.
At the scene of a massacre on a water bus caused by Unidentified Lifeforms, a suspicious person with a neck tattoo is arrested.
The moment after the case of Unidentified Lifeform #23 is solved, the combined investigation headquarters grows tense with the appearance of an unidentified flying object heading for Tokyo.
The unidentified flying object that came flying to Kuuga's side combines with the TryChaser 2000 and becomes Kuuga's new machine: TryGoram.
For the moment the case of Unidentified Lifeform #24 is solved.
On a refreshing, cloudless day, Yusuke is practicing his 1808th technique, Stomp.
Yusuke is emergency hospitalized after Unidentified Lifeform #26, mushroom-type monster Me-Ginoge-De, breathes its spores on him and in spite of the intensive first-aid measures he receives.
Yusuke survives the grip of death and defeats Unidentified Lifeform #26, mushroom-type monster Me-Ginoga-De, and to have his body looked over, together he and Ichijo visit Tsubaki.
The fight between Kuuga and Unidentified Lifeform #3, bat-type monster Zu-Gooma-Gu, is interrupted by a mysterious rider.
Recently Yusuke has noticed a shocking sensation like an electric current rippling inside his body while he fights Unidentified Lifeforms, and to solve this mystery he asks Sakurako to decipher more inscriptions
In the face off with Unidentified Lifeform #36, praying mantis-type monster Me-Garima-Ba, Kuuga fights with the TryGoram but its knockout attack doesn't work on Me-Garima-Ba.
It's been one month since Purple Kuuga changed into a stronger form.
Yusuke as Kuuga becomes Rising Pegasus and fires an air arrow but is unable to deal the finishing blow to Unidentified Lifeform #37, owl-type monster Go-Buuro-Gu, and his transformation is undone from losing all his energy.
It's a day during the summer. Yusuke and Sakurako tend the shop while the owner, Nana, Minori and Minori's coworker Ayako go out to a pool.
During a discussion between Yusuke, Ichijo and Tsubaki, they confirm that Kuuga's golden power is produced by the magical artifact inside Yusuke's body, the Amadam, in response to his intent to want to become stronger.
Kuuga falls before the powerful enemy shark-type monster Go-Gamego-Re and Yusuke is taken to Tsubaki's side.
With the golden power of his red form, Yusuke defeats Unidentified Lifeform #39, shark-type monster Go-Gamego-Re but the media and police department emphasize that the enormous damage caused by #39's giant explosion was due to #4's independent actions.
The TryChaser2000 is forced to finally be retired due to the metal fatigue of combining with Goram and the battle with grasshopper-type monster Go-Badaa-Ba.
A case breaks out of consecutive mysterious deaths of Midorikawa Academy second year boy students.
Unidentified Lifeform #42, porcupine-type monster Go-Jaraji-Da, is given the rule to kill Midorikawa Academy's second year boy students and repeatedly murders.
Sakurako studies the letters drawn in blood that were left at the scene of Unidentified Lifeform murder cases, and tells Ichijo who has arrived in Nagano that those letters were originally of the Gurongi alphabet.
While Sakurako at Shinano University examines the characters for 'warrior' carved on the restored ruins, Yusuke and Sakurai's force are running about Tokyo after the appearance of Unidentified Lifeforms #3 Zu-Gooma-Gu and #43 Go-Zazaru-Ba.
Ichijo is injured by the woman with a rose tattoo and taken to Kanto Medical University. Thinking he has to do his best on Ichijo's behalf as well, Yusuke ruminates on the rules of Unidentified Lifeform #43 Go-Zazaru-Ba's game.
Unidentified Lifeform #43 Go-Zazaru-Ba continues the murder game within the city and Unidentified Lifeform #3 Zu-Gooma-Gu rampages in Chiba prefecture.
While Unidentified Lifeform #0 continues slaughtering a great number of other Lifeforms, Yusuke, Sakurako, Ichijo, Hikari and others all gather at Jonan University and report the results of each of their investigations.
Kuuga approaches Unidentified Lifeform #44, shark-type monster Go-Jaaza-Gi, but he is injured when Go-Jaaza-gi attacks suddenly from the sea.
Unidentified Lifeform #45, buffalo-type monster Go-Baberu-Da appears, and a massacre larger than any others so far unfolds throughout the city.
Unidentified Lifeform #45, buffalo-type monster Go-Baberu-Da is defeated, and in the brief moment of peace he's given, Ichijo heads to Mika Natsume's flute competition.
In response to the Unidentified Lifeforms who are growing stronger one after another, the combined police force feels a growing sense of danger and tasks Hikari Enokida of the Police Science Division with making countermeasures.
Finally Unidentified Lifeform #46, rhino beetle-type monster Go-Gadoru-Ba begins the Gegeru.
Yusuke has been trying to enhance his golden power even further for the fierce battle with #0 he expects to have, and just then becomes able to control that golden power to defeat Unidentified Lifeform #46, rhino beetle-type monster Go-Gadoru-Ba.
Through the efforts of Kuuga and the police, Unidentified Lifeform #46 Go-Gadoru-Ba is defeated. However it simultaneously means #0 will bring forth the ultimate darkness.
Yusuke resolves to become the 'dreadful warrior' in order to defeat #0, and before that final deciding battle, he rides his bike through the unrelenting downpour to give thanks once again to all the people who supported him.
To defeat the one who brings the ultimate darkness, N-Daguba-Zeba, Yusuke transforms into the Ultimate Form, the dreadful warrior. Staining the brilliant white snow field with crimson blood in this literal fight to the death, at last the conclusion is reached.
Watch Kamen Rider Season 10, Episode 11: Promise online on FlixGems. It's March 25th. For the sake of a promise, Yusuke heads to his old elementary school.