Season 1

E1. These Two Are A Best Match

Sep 3, 2017 · 24m

Unidentified creatures called Smash have appeared at Touto, Sento Kiryu turns into Kamen Rider Build to fight against them. One day, he saves a guy named Ryuga Banjo who escaped from a prison.

E2. Innocent Runaway

Sep 10, 2017 · 24m

Because of helping Ryuga, the government chased Build as a wanted criminal. Sento guesses that he can obtain clues to the mysterious organization by finding true culprit who killed Katsuragi.

E3. Borderline of Justice

Sep 17, 2017 · 24m

Sento follows the clues regarding Nabeshima, the man responsible for framing Ryuga.

E4. The Testimony Will Be Zero

Sep 24, 2017 · 24m

After getting another of his memories back, Sento investigates the connection between Faust's experiments and the Pandora Box; Ryuga tracks down Nabeshima's family and stands up to protect them from the enemy.

E5. Dangerous Identity

Oct 1, 2017 · 24m

While confronting Souichi about his connection with Faust, Sento is informed by Sawa about a hint regarding a person who may know his true identity.

E6. Moonsault of Anger

Oct 8, 2017 · 24m

Ryuga deceives Sento, and tries to find Faust's hideout by himself.

E7. The Devil's Scientist

Oct 15, 2017 · 24m

There is a possibility that true culprit who killed Katsuragi was Sento, but Sento have lost his memory. Ryuga feels a distrust for Sento.

E8. Memory Starts to Talk

Oct 22, 2017 · 24m

Sento discovers that Katsuragi was the founder of Faust, and approaches his mother to learn more about Katsuragi's intentions, and obtain more clues regarding his lost memories.

E9. The Trap of Project Build

Oct 29, 2017 · 24m

Sento and Ryuga discover that Katsuragi was involved in creating a Build Driver of his own, and his possible involvement with Sento widens the distrust between them.

E10. Technology of Destruction

Nov 12, 2017 · 24m

Upon learning of Faust's plan to steal the Pandora Box, Sento and Ryuga set out to Touto Institute of Advanced Matter Physics to protect it.

E11. Burn, Dragon

Nov 19, 2017 · 24m

If Blood Stalk's identity is Katsuragi, Ryuga can prove his innocence. But Sento can't control Key-Dragon form's power.

E12. Conspiracy Theory

Nov 26, 2017 · 24m

After learning from Sawa about the connection between Faust and Nanba Heavy Industries, Sento and Ryuga confront them to retrieve the Pandora Box and their stolen Full Bottles.

E13. Who Takes Off the Veil?

Dec 3, 2017 · 24m

Sento gets a terrible shock, because he learns the identity of the wirepuller from Nabeshima who regained his memory.

E14. The False Kamen Rider

Dec 10, 2017 · 24m

An expected person steals Pandora Box, Panels and Bottles from Sento.

E15. Judge Sento Kiryū!

Dec 17, 2017 · 24m

Sento and guys were driven into a situation where they had to hide Pandora Box in a old warehouse. They make a decision to uncover a government conspiracy.

E16. The Weaponry Hero

Dec 24, 2017 · 24m

It's revealed the real facts of the case that Katsuragi was murdered.

E17. The Outbreak of the Rider Wars

Jan 7, 2018 · 24m

As the three countries start a war, both Sento and Ryuga must decide what to do next.

E18. The Golden Soldier

Jan 14, 2018 · 24m

Sento confronts Kazumi Sawatari, an assassin from Hokuto, wondering how the enemy got his hands on his latest invention.

E19. The Forbidden Item

Jan 21, 2018 · 24m

With he and Ryuga unable to beat Kazumi and his men with their current strength, Sento searches the files left by Takumi to look for an alternative.

E20. Devil's Trigger

Jan 28, 2018 · 24m

Soichi approaches Sento and gives him an item that can stop Ryuga's rampage, but using it involves a huge risk.

E21. The Unstoppable Hazard

Feb 4, 2018 · 24m

Despite knowing the risks, Sento uses the Hazard Trigger to empower himself against Kazumi's three subordinates. After losing his consciousness and killing one of them, Sento is struck with guilt and refuses to keep fighting, until Soichi gives him an alternative.

E22. Victory of Tears

Feb 11, 2018 · 24m

Sento and Kazumi have a duel to settle the war, but when the enemy proves himself too strong for him, Sento has no option but to use the Hazard Trigger again.

E23. The Phantom of the West

Feb 18, 2018 · 24m

Taking advantage of the conflict, Seito invades and conquers Hokuto. Now bent on seizing all of Japan, the Seito forces invade Touto, led by the mysterious Kamen Rider Rogue.

E24. The Man Called Rogue

Feb 25, 2018 · 24m

Gentoku reappears as Kamen Rider Rogue, determined to get revenge on Touto. To stop him, the other Kamen Riders decide to join forces, when Sento perceives something strange happening with Misora.

E25. The Idol's Awakening

Mar 4, 2018 · 24m

Just as Gentoku is about to finish off Sento and the others, Misora appears before them, and the secret behind her mysterious powers is revealed.

E26. The Treacherous Deathmatch

Mar 11, 2018 · 24m

Seito challenges Touto for another proxy battle to end the war once and for all. Sento and his friends make preparations to confront Gentoku and his subordinates, unaware that one among them is a traitor.

E27. The Counterattack Hero

Mar 18, 2018 · 24m

The proxy battle to end the war is tied with one victory to each side, and for the decisive bout against Gentoku, Sento unleashes a new power.

E28. The Genius Arrives With a Tank

Mar 25, 2018 · 24m

Despite using his new powers, Sento is having a hard time against Gentoku, and Sawa reveals to the others the reasons for her betrayal.

E29. The Opening Bell Rings

Apr 1, 2018 · 24m

The war between the nations has ended, but Soichi and Namba finally reveal their true intentions as a new conflict begins when they open the Pandora Box.

E30. The Truth of the Pandora Box

Apr 8, 2018 · 24m

Vernage, the Queen of Mars possesses the body of Misora to assist the Riders in retrieving the Pandora Box, revealing an important secret about Ryuga in the occasion.