Kamen Rider Build: Rebirth

. Kamen Rider Build: Rebirth is the sequel to Kamen Rider Build.

The tagline of the series is "Now, shall we continue the experiment?" (さぁ、実験を続けましょう.) One of the underlying motifs of this season is science and scientific principles.

Plot
1= "It has been 11 years since Evolto was defeated, The Kamen Riders stand to a bigger threat, Yami Build. Now the Riders fight to protect Earth!"

- Narrator (episodes 1-19)

2= "Evolto has returned! He has started devouring more planets and now, the last one is Earth!"

- Narrator (episode 20-31)

3= "The Giga Pandora Box has appeared, Nariaki Utsumi tends to open it, but Kamen Riders protect it!"

- Narrator (episode 31-Present)

11 years ago, the “Pandora Box” was found on Mars. On Earth, it created walls that divided Japan into Touto (Eastern Capital), Hokuto (Northern Capital) and Seito (Western Capital) and brought along the Smash, unidentified lifeforms that attack people.

Sento Kiryu, a prodigy physicist, transforms into Kamen Rider Build to fight the Smash.

The Touto government requests his help in deciphering the mystery behind the Pandora Box and the Smash. There is one mystery not even Sento can solve: his own past. The only memory he has left for more than 20 years is the existence of a sinister figure called Night Rogue. There is one man who holds the key to Sento’s memories: A prison escapee by the name of Ryuga Banjo, who adamantly denies committing the murder he is accused of. Misora Isurugi, who works with Sento, has the ability to purify the harmful components the Smash are made of.

Sento transforms into Kamen Rider Build in order to uncover the mystery surrounding the Pandora Box, the Smash and his amnesia. Now, the new battle begins. Yami Build confronts the Riders. And now a new capital is made!