A team of archaeologists open a tomb that awakens a horde of monsters, while adventurer Yusuke Godai has visions of using a strange belt from the tomb to fight back against them.

A drunkard witnesses a murder by an Unidentified Life Form near a Church. Meanwhile, Yusuke is bothered by the idea of fighting and is unsure if it is the right thing to do.

With Unidentified Life Forms appearing in nearby neighbourhoods, the police create a Special Task Force to combat them all, including Numbers 2 and 4 - Kuuga. Ichijo, unable to provide evidence that Kuuga saved him before, tries to warn Yusuke to stay away from Nagano.

As #5 continues to rampage with her speed through Tokyo, Ichijou must come to a decision regarding whether to work alongside Yusuke.

Yusuke discovers the effect of the mysterious belt on himself and his connections to those he cares about as the battle with a grasshopper Unidentified Lifeform brings about a new change.

Yusuke tries to decipher the meaning behind his new "blue" form, while Sakurako's continued research makes new discoveries regarding his secrets and how to use them.

A girl associated with a murdered researcher of the secret tomb approaches Ichijou and Yusuke about her dilemma, as the Unidentified Lifeforms begin a new approach to their killings.

Yusuke must discover a way to control the hyper-senses of his new Green form while trying to prevent Mika from bringing herself to a tragic end over her father's death.

Yusuke's sister Minori begins to feel distant from her older brother as the Tokyo police attempt to pinpoint the Gurongi hideout.

As Yusuke tries to help Minori cope with 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 realize the lesson Yusuke gave him as he 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 who claims to be a Gurongi who committed a violent attack.

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 war 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.