It is the nineteenth series in the Heisei period run and the twenty-eighth series overall. Toei registered the Kamen Rider Build trademark on June 5, 2017. The show premiered on September 3, 2017, following the finale of Kamen Rider Ex-Aid, joining Uchu Sentai Kyuranger and later, Kaitou Sentai Lupinranger VS Keisatsu Sentai Patranger in the Super Hero Time line-up. Unlike the previous “Heisei Phase 2” series which all takes place in the same universe, Kamen Rider Build takes place in an alternate universe.
Ten years ago, a Martian expedition crew brought a mysterious artifact nicknamed the “Pandora Box” to Earth. The artifact was activated during a national conference which caused a massive catastrophe in the form of a Skywall which split Japan into three regions: Seito in the west, Hokuto in the north, and Touto in the east, with each region holding onto the fragments of the Pandora Box. In the present day, a genius physicist named Sento Kiryū is hired by the government-funded Touto Institute of Advanced Matter Physics in uncovering the Pandora Box’s secrets. But Sento, having no memory of his past other than being held captive by the mysterious Night Rogue of the Faust organization, secretly moonlights on the side as Kamen Rider Build to fight the Smash monsters created from victims of Faust’s experiments. Aided by cafe owner Sōichi Isurugi and his daughter Misora, who can purify Smash elements, Sento also befriended a framed fugitive named Ryūga Banjō who escaped while being experimented on by Faust and who eventually gained the ability to transform into Kamen Rider Cross-Z.
The two Kamen Riders eventually learn that Night Rogue is none other than Gentoku Himuro, the son of Touto’s Prime Minister, Taizan Himuro and that his former ally Blood Stalk is Sōichi, who caused the Skywall disaster and works with industry mogul Jūzaburō Namba in manipulating the nations into declaring a civil war, which in reality is a ploy in order to reassemble the Pandora Box. The revelation worsens when Sento learns he was actually Faust’s founding member, Takumi Katsuragi, Sōichi having wiped his memories while altering his face into that of the deceased musician Tarō Satō. Hokuto sends Kazumi Sawatari, a soldier who can transform into Kamen Rider Grease, along with their own army to steal Touto’s Pandora Box and fullbottles. Though Sento managed to defeat Kazumi after their nations agreed to settle things in a decisive duel, Seito seized this moment to conquer a defenseless Hokuto. Seito then turns it attention to invade Touto, assisted by an exiled Gentoku who gain the ability to transform into Kamen Rider Rogue, with Kazumi joining Sento’s group to liberate Hokuto. But it was during this battle that Sōichi is revealed to be an unwilling host to Evolto, a mysterious extraterrestrial entity responsible for wiping all life on Mars and the true mastermind of all the catastrophes.
After unleashing the true power of a nearly complete Pandora Box, Evolto eventually managed to gain back the Evol Driver and Evol-Trigger to transform into the nigh-omnipotent Kamen Rider Evol. He also revealed that Ryuga is actually a part of himself, transferring himself into Ryuga’s body in order to gain even more strength. Evolto also kills Namba and his cohorts after no longer needing them. A repentant Gentoku joins Sento to stop the alien as the latter regained his memory as Takumi and acquires the means to fight a fully corporeal Evolto on equal ground. While Evolto is aided by Namba’s former aide Nariaki Utsumi after becoming Kamen Rider Mad Rogue and Takumi’s father Shinobu Katsuragi, the alien was unaware that the two are acting against him as Shinobu gives Takumi the means for him and Ryūga to destroy Evolto once for all. With Evolto managing to fully restore the Pandora Box, the final battle for humanity ends with the alien’s demise when Sento caused the Pandora Box to assimilate his reality into the “Prime” Kamen Rider world, creating a new world where the Skywall incident and the resulting tragedies never happened. While saddened that none of their friends remembered them and their times together, Sento and Ryūga resolves to start making a new life for themselves in this new reality.
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