S1 E1 - These Two Are A Best Match

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.

Sep 3, 2017 • 24m

S1 E2 - Innocent Runaway

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.

Sep 10, 2017 • 24m

S1 E3 - Borderline of Justice

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

Sep 17, 2017 • 24m

S1 E4 - The Testimony Will Be Zero

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.

Sep 24, 2017 • 24m

S1 E5 - Dangerous Identity

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.

Oct 1, 2017 • 24m

S1 E6 - Moonsault of Anger

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

Oct 8, 2017 • 24m

S1 E7 - The Devil's Scientist

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

Oct 15, 2017 • 24m

S1 E8 - Memory Starts to Talk

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.

Oct 22, 2017 • 24m

S1 E9 - The Trap of Project Build

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.

Oct 29, 2017 • 24m

S1 E10 - Technology of Destruction

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.

Nov 12, 2017 • 24m

S1 E11 - Burn, Dragon

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

Nov 19, 2017 • 24m

S1 E12 - Conspiracy Theory

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.

Nov 26, 2017 • 24m

S1 E13 - Who Takes Off the Veil?

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

Dec 3, 2017 • 24m

S1 E14 - The False Kamen Rider

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

Dec 10, 2017 • 24m

S1 E15 - Judge Sento Kiryū!

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.

Dec 17, 2017 • 24m

S1 E16 - The Weaponry Hero

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

Dec 24, 2017 • 24m

S1 E17 - The Outbreak of the Rider Wars

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

Jan 7, 2018 • 24m

S1 E18 - The Golden Soldier

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

Jan 14, 2018 • 24m

S1 E19 - The Forbidden Item

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.

Jan 21, 2018 • 24m

S1 E20 - Devil's Trigger

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

Jan 28, 2018 • 24m

S1 E21 - The Unstoppable Hazard

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.

Feb 4, 2018 • 24m

S1 E22 - Victory of Tears

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.

Feb 11, 2018 • 24m

S1 E23 - The Phantom of the West

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.

Feb 18, 2018 • 24m

S1 E24 - The Man Called Rogue

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.

Feb 25, 2018 • 24m

S1 E25 - The Idol's Awakening

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.

Mar 4, 2018 • 24m

S1 E26 - The Treacherous Deathmatch

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.

Mar 11, 2018 • 24m

S1 E27 - The Counterattack Hero

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.

Mar 18, 2018 • 24m

S1 E28 - The Genius Arrives With a Tank

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

Mar 25, 2018 • 24m

S1 E29 - The Opening Bell Rings

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.

Apr 1, 2018 • 24m

S1 E30 - The Truth of the Pandora Box

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.

Apr 8, 2018 • 24m

S1 E31 - Surge Out, Magma!

As the Riders invade the Pandora Tower to retrieve the Pandora Box, a new power bursts from Ryuga, just as questions about his true identity are raised.

Apr 15, 2018 • 24m

S1 E32 - Programmed Tragedy

Doubtful about his own origins, and eager to know the reason why he was framed in the first place, Ryuga confronts Blood Stalk demanding for answers.

Apr 22, 2018 • 24m

S1 E33 - The Final Weapon: Evol

Touto's Prime Minister, Taizan Himuro is kidnapped, and Blood Stalk demands Sento to develop a new driver for him in exchange for his life.

Apr 29, 2018 • 24m

S1 E34 - The Best Match is Dissolved

Having attained the power to transform into Kamen Rider Evol, Evolto infects Sento with a poison, threatening his life should he not relinquish the Fullbottles in his possession.

May 6, 2018 • 24m

S1 E35 - Tower of Destruction

Evolto is close to attain all Fullbottles and the Pandora Box, and with Ryuga under the enemy's control, Sento turns to Gentoku for help.

May 13, 2018 • 24m

S1 E36 - Evolto Hunts Planets

Having finally opened the Pandora Box, Evolto almost destroyed the world, should Vernage had not interfered. However, Sento has run out of options, and decides to risk it all in a move to defeat him.

May 20, 2018 • 24m

S1 E37 - The Ultimate Phase

Evolto avoided his destruction by possessing Sento's body. Now unable to transform, Ryuga looks for a way to save his friend.

May 27, 2018 • 24m

S1 E38 - Mad World

Evolto reaches his full potential and seems unstoppable, while Sento recovers his memories as Katsuragi.

Jun 3, 2018 • 24m

S1 E39 - The Unstoppable Genius

To face the full power of Evolto and Utsumi, Sento combines the power of all Full Bottles to unleash his most powerful form.

Jun 10, 2018 • 24m

S1 E40 - The Final Revolution

Surprised with the advent of Build's new form, Evolto decides to begin the last steps of his master plan.

Jun 17, 2018 • 24m

S1 E41 - The Truth of the Best Match

Sento discover that his father is alive, and by searching the files he got from his mother, he learns why the Rabbit and Tank Full Bottles have a special meaning to him.

Jun 24, 2018 • 24m

S1 E42 - Legacy of Doubt

With Sento confused with the fact that his father might be in league with Evolto, another person transformed into Kamen Rider Build appears before him.

Jul 1, 2018 • 24m

S1 E43 - Another Build

As Sento still tries to figure out his father's true motives, Misora is kidnapped by Evolto and transformed into a Smash.

Jul 8, 2018 • 24m

S1 E44 - The End of Evolto

Kazumi and Gentoku infiltrate Faust's headquarters in Hokuto, but Utsumi appears to face them. Meanwhile, Sento confronts his father, who reveals the true reason why he joined forces with Evolto.

Jul 15, 2018 • 24m

S1 E45 - The Scientist of Hope

Evolto has been defeated, and Shinobu reveals to the Riders his true objective.

Jul 22, 2018 • 24m

S1 E46 - An Oath to Be the One

With Evolto one step closer from reaching his objective, Sento and the others prepare themselves for the final battle.

Jul 29, 2018 • 24m

S1 E47 - Zero Degree Flames

Despite Sento's warnings, Kazumi uses the Blizzard Knuckle to attain a new, powerful form, knowing that he may not survive the transformation.

Aug 12, 2018 • 24m

S1 E48 - To a World of Love & Peace

With no time to mourn for Kazumi's death, Sento, Ryuga and Gentoku brace themselves for the final battle against a full-powered Evolto.

Aug 19, 2018 • 24m

S1 E49 - The Tomorrow Build Will Create

After the sacrifice of his companions, it falls to Sento to protect the world by defeating Evolto once and for all.

Aug 26, 2018 • 24m