Season 1

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...

As Yusuke tries to convince Minori to accept his changes, he tries to figure out a method to bring out the fourth Kuuga form.

Yusuke's plan to meet with a former teacher to keep an old promise becomes interrupted with the attack of a powerful Gurongi.

Sakurako helps Yusuke's former teacher renew his confidence all while Yusuke works on a new move for Kuuga to defeat the rhino Gurongi.

While a new discovery at the Kuuga tomb begins to emerge, Ichijo investigates a man with a neck tattoo that was at the scene where a Gurongi committed a massacre aboard a ferry.

Kuuga escapes battle with Unidentified Lifeform No. 23. While getting treated for injuries sustained in battle, Yuusuke is reunited with someone who has turned their back on life...

Ichijo feels the pressure of working on an important day as he and Yusuke try to decipher the truth of the mysterious artifact flying towards Tokyo.

With the Gurongi case seemingly over, Yusuke is brought in to have his bike and its new armor studied as Ichijo tries to reach out to his sick mother.

A recap of the past battles between Kuuga and the Gurongi in the midst of Yusuke facing a powerful opponent.

When Yusuke becomes poisoned by a sickly Gurongi, his friends and allies must come together to figure out what to do next.

Tsubaki and Sakurako try to figure a way of saving Yuusuke's life as Ichijou and the police continue to track down the deadly mushroom Gurongi.

Yusuke catches up with his friends after his death scare as Me·Ginoga·De returns once again.

Ichijou tracks the Bat Gurongi as it flies between Tokyo and Nagano for an unknown reason as a Gurongi begins a new assault to gain a promotion in position.

As Ichijou continues to track the Bat Gurongi and figure on how to deal with the tricky means of Me·Galme·Re, he makes new discoveries regarding the motives of the Gurongi attacks.

Yusuke and Sakurako worry about Kuuga's increasing power and the Rider's increased pain as the last "Me" Gurongi makes her move at promotion.

With his powers uncontrollable and Me·Garima·Ba unable to be defeated on his own, Yuusuke tries to figure out the means to master and control the growing power within Kuuga.

Yusuke's old teacher becomes worried for an elusive student who skips school to go to Tokyo just as the first Go-Level Gurongi starts his game.

While dealing with his first Go-level opponent, Yuusuke tracks down his teacher's student in order to help him determine his problems in coping.

Minori's friend frets over the future her unborn child will have in a world with the Gurongi as a new Go-level begins to attack swimming pools.

Yuusuke and Ichijo try to finally discover a pattern to the Go-level Gurongi in order to find the clue for stopping Go·Bemiu·Gi's watery attacks.

Tsubaki tries to explain and warn about Yuusuke's new upgrades, while a former problem prepares for a contest amidst a Gurongi attack.

Junichi bemoans his problems in trying to figure out where he belongs in the midst of the Gurongi crisis while Yusuke realizes what he must do to defeat the defense of Go·Gamego·Re.

In the aftermath of the destruction of his previous battle, Yuusuke recaps the evolution of Kuuga's Rising form while Go·Badaa·Ba finally begins his Gegel.

As Yuusuke becomes outclassed by Go·Badaa·Ba, Ichijou tries to figure the means to defeat it with or without an upgraded bike being held up by the police's fears of Kuuga's growing power.

As Yusuke continues to struggle to find some way of stopping Go·Badaa·Ba, Ichijou makes a last-ditch effort to gain the upgraded bike for Kuuga by any means necessary.

Yuusuke and Ichijou investigate a Gurongi massacring boys at a high school, while a murder summons Sakurako back to Nagano for further investigation.

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.

Following a realization, Sakurako and Ichijou enter the Gurongi tomb to find new clues on the mysterious #0 as two Gurongi battle in Tokyo.

Sakurako makes a discovery regarding Kuuga's further evolution even as Goma continues to interfere and cause problems with his pursuit of the Gegel mastermind.

Balva, Goma and Sakurako continue to hint at the threat of the return of Daguva, even as Yuusuke and the police try to figure out #43's pattern.

With dual crisis, Yuusuke must manage Go·Zazalu·Ba so he can deal with the rampaging Xu·Goma·Gu as he continues to kill to draw out Daguva.

Yuusuke, Sakurako, Ichijou and Enokida discuss Kuuga, #0 and the mysterious final prophecy as another Gurongi begins attacking airplanes.

Yuusuke comforts Nana when she tries to help her understand the means to be an actor in regards to an exercise associated with the Gurongi massacres.

After an extremely intense battle with a powerful Gurongi, Yusuke and his allies discuss the connections that exist between Kuuga and his opponents.

Ichijou goes to support Mika taking part in a flute contest, where he gets involved in a hostage crisis in progress.

Enokida tries to figure how to balance her work and her motherly duties as the final Go-Level Gurongi uses a tactic to guarantee passage through the Final Gegel.

As Yuusuke is defeated by the strengthened Go·Gadol·Ba, Enokida rushes to complete the Nerve-Shattering Bullets even at risk of estranging her son.

Sakurako convinces Tsubaki to do another upgrade for Yuusuke to solidify his power and handle Gadol while Jean assists Enokida in trying to handle her connection with her son.

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....