Kamen Rider Build: Be The One

Kamen Rider Build: Be The One (劇場版 仮面ライダービルド: ビー・ザ・ワン) is the summer movie adaptation of Kamen Rider Build, double billed with the 's summer movie, '.

The film will be released on Blu-ray and DVD on January 9, 2019.

Synopsis
Set after the events of the Japanese Civil War, the newly appointed governors of Seito, Hokuto and Touto now support each other in their mission to reunify Japan, however they are secretly members of Evolto's home clan known as the Blood Tribe, who each have assumed government positions in order to take over the entire world. Being certain that Sento Kiryu/Kamen Rider Build is a major threat to their plans, they proceed with their "Build Annihilation Plan" (ビルド殲滅計画) to manipulate Sento's friends and other civilians against him. With Ryuga Banjo now against him, Sento must find a way to fight and survive as he hunts for the truth to stop the Blood Tribe in succeeding with their ultimate plan.

Plot
The movie begins with a POV shot of the Pandora Box being released and the walls going up, it appears to be from Sento’s eyes and his father telling him to get somewhere safe. Quick cuts to present day with a public conference of the unification of Seito, Hokuto and Touto and the designation of a governor for each region with Pandora Tower at its center. Sento is complaining about the heat while riding his bike on the phone to Sawa and Misora. He comes across a brother and sister being attacked by two Smash. He transforms and fights before the screen cuts back to a new character, Kengo Ino, at the press conference. He says for peace to come, Kamen Riders must become extinct and the crowd chants extinction. He uses his ability to manipulate the civilians who fall silent and begin walking off different directions, entirely noiseless. Build defeats the two Smash when groups of civilians appear, charging at him, engulfing him.

He manages to sneak out of the crowd and is chased throughout town, even getting back to the Cafe and is attacked by Sawa and Misora. He releases some gas in the lab and hides in the Fullbottle purification machine until they’re knocked out.

The three governors have a meeting with Evolto and reveal themselves to be the Blood Tribe, survivors of the same race as Evolto who aim to destroy the planet and consume it. It is revealed also that they had been acting in the shadows ever since the Skywall appeared and manipulated each territory and the entire war but Evolto changed his mind and their plans were disrupted. Evolto tells them he won’t intervene in what they want to do but reminds them he has the upper hand with the power of the Pandora Box.

Ryuga is picked up in a limo after visiting his girlfriend’s gravestone. Mitsuomi, the Zebra Lost Smash, appears in the limo and Ryuga jumps out from the car and they both transform and fight. Mitsuomi reveals that he was the one who ordered Kasumi to be turned into a Smash. Ryuga loses the fight and is taken under control like the other civilians.

Sento infiltrates a lab and discovers the three governors are the other astronauts from the Mars mission. He’s found out and is chased again by civilians and runs into Kazumi and Gentoku who transform to help hold them for Sento to escape. Ryoka (Touto’s governor) appears before them and becomes the Scissors Lost Smash, wanting to take down Build. Sento gets away as Kazumi and Gentoku are captured and Build then has to face off against Ryuga and Kengo. Ryuga beats him and takes the Hazard Trigger off him. Scissors & Zebra Lost Smashes and Ryuga are used with the Hazard Trigger, Cobra Lost Fullbottle and Great Cross-Z Dragon for Kengo to become Kamen Rider Blood. He easily defeats Sento, but before he deals the final blow, Evolto teleports in and takes Sento away.

Sento awakes on a boat with Soichi while it’s raining hard outside. They talk and Sento leaves, visiting the alley where Soichi “found” him without his memories. In his mind, Sento talks with Takumi about the events leading up to this point including the fact that the Rider System was one of the biggest causes of the war, a thought Sento keeps struggling with. They argue that to win, he’ll have to kill Ryuga, which Sento disregards. Utsumi offers to break Kazumi and Gentoku out of captivity if they beg; Kazumi shrugs him off, but Gentoku is already on his hands and knees.

Ino contacts Sento and demands the Pandora Box in exchange for Ryuga’s life.

Ryuga, Kengo, Mitsuomi and Ryoka are outside, surrounded by civilians still under their control. Sento arrives on his bike with the colored panels of the Pandora Box. Kengo becomes Kamen Rider Blood and Sento goes straight to Genius Form. Ino reveals that his encounter with Ryuga was something they orchestrated. They fight and Sento recalls the memory where his father tells him that Ryuga holds the key to all the events to come. Sento asks why he became a scientist and his father replies for "Love & Peace". He manages to pull Ryuga out of Blood. Blood takes the Pandora box down into the ground, heading for the center of the Earth to destroy the planet. Gentoku and Kazumi appear and take on the Scissors and Zebra Lost Smashes. Misora regains her senses and heals Ryuga from Kengo’s control. The Rabbit and Dragon Fullbottles fuse and they transform into Cross-ZBuild Form.

They head down to fight Blood and while they initially struggle to control their new form, they force Blood back to the surface and perform the Love & Peace Rider Kick. Kazumi and Gentoku win their battles respectively.

The humans under Blood Tribe control have forgotten all about what happened and Sento is a bit disappointed no one knows what they went through. The brother from the beginning of the movie happens to walk by and thank him for saving him.

In a post-credits scene, Sento is working on the White Pandora Box panel, when it suddenly opens up a time bottle that engulfs him. He’s now outside and overhears fighting over the side of the cliff; all the Heisei Riders are there fighting their respective final villains. The Time Majin flies in and lands, Zi-O jumps out. Sento and he briefly talk and Zi-O comments how he already has Build’s power. He uses the Build Ridewatch and jumps off the cliff, the armor attaches onto him mid-fall. He fights the villains for a little while then uses Build’s Rider Kick attack and slides around hitting all the villains.

Continuity and Placement

 * Kamen Rider Build: This movie takes place shortly after the announcement of the three new governors in episode 45, but before 46.
 * Kamen Rider Zi-O: to be announced

Allies

 * Misora Isurugi
 * Sawa Takigawa
 * Vernage

Other

 * Soichi Isurugi
 * Nariaki Utsumi

Villains



 * Kazari
 * Gamel
 * Cancer Zodiarts
 * Virgo Zodiarts
 * Leo Zodiarts
 * Sagittarius Nova
 * Evolved Gremlin
 * Lord Baron
 * Heart
 * Medic
 * Gamma Ultima Ebony
 * Gamedeus

Cast

 * Sento Kiryu (桐生 戦兎): Atsuhiro Inukai (犬飼 貴丈)
 * Ryuga Banjo (万丈 龍我): Eiji Akaso (赤楚 衛二)
 * Kazumi Sawatari (猿渡 一海): Kouhei Takeda (武田 航平)
 * Misora Isurugi (石動 美空): Kaho Takada (高田 夏帆)
 * Nariaki Utsumi (内海 成彰): Yuki Ochi (越智 友己)
 * Sawa Takigawa (滝川 紗羽): Yukari Taki (滝 裕可里)
 * Takumi Katsuragi (葛城 巧): Yukiaki Kiyama (木山廉彬)
 * Gentoku Himuro (氷室 幻徳): Kensei Mikami (水上剣星)
 * Soichi Isurugi (石動 惣一): Yasuyuki Maekawa (前川泰之)
 * Evolto (エボルト), Evol Driver (エボルドライバー): Tetsuo Kanao (金尾 哲夫)
 * Build Driver (ビルドドライバー): KORBY (コービー)
 * Sclash Driver (スクラッシュドライバー), Cross-Z Magma Knuckle (クローズマグマナックル): Norio Wakamoto (若本 規夫)

Guest cast

 * Kengo Ino (伊能賢剛): Masanobu Katsumura (勝村政信)
 * Mitsuomi Gohara (郷原光臣): Takashi Fujii (藤井隆)
 * Ryoka Saiga (才賀涼香): Rena Matsui (松井玲奈)
 * Shinobu Katsuragi (葛城 忍): Joji Kokubo (小久保丈二)
 * Kamen Rider Zi-O (仮面ライダージオウ): So Okuno (奥野 壮)

Suit Actors

 * Kamen Rider Build: Seiji Takaiwa (高岩 成二)
 * Kamen Rider Cross-Z: Eitoku (永徳)
 * Kamen Rider Grease: Satoshi Fujita (藤田 慧)
 * Kamen Rider Rogue: Jun Watanabe (渡辺 淳)
 * Kamen Rider Blood: Yasuhiko Imai (今井 靖彦)
 * Zebra Lost Smash: Hajime Kanzaki (神前 元)
 * Scissors Lost Smash: Yasuaki Ishii (石井 靖見)

Fullbottles

 * Bottle used:
 * Build
 * Organic: Rabbit, Taka, Lion (in Build Phone), FullFull RabbitTank (Rabbit Mode), Gold Rabbit, Silver Dragon
 * Inorganic: Tank, Gatling, FullFull RabbitTank (Tank Mode)
 * Other: Hazard Trigger, Genius, Cross-ZBuild Can
 * Cross-Z
 * Organic: Dragon Magma
 * Inorganic:
 * Other: Cross-Z Magma Knuckle
 * Grease
 * Organic:
 * Inorganic:
 * Rogue
 * Organic: Crocodile Crack
 * Inorganic:
 * Blood
 * Organic: Cobra Lost
 * Inorganic:
 * Other: Great Cross-Z Dragon, Hazard Trigger
 * Zebra Lost Smash
 * Shimauma Lost
 * Scissors Lost Smash
 * Hasami Lost
 * Form used:
 * Build
 * RabbitTank Form, HawkGatling Form, RabbitRabbit Form, TankTank Form, Genius Form, Cross-ZBuild Form
 * Cross-Z
 * Cross-Z Magma, Cross-ZBuild Form

Sclashjellies

 * Jelly used:
 * Grease
 * Robot

Evolbottles

 * Bottle used:
 * Cross-Z
 * Organic: Great Dragon
 * Inorganic:
 * Other: Great Cross-Z Dragon
 * Evol
 * Organic: Cobra
 * Inorganic: Rider
 * Other: Evol Trigger
 * Form used:
 * Cross-Z
 * Great Cross-Z
 * Evol
 * Black Hole Form (Phase 4: Perfection)

Ridewatches

 * Watch used:
 * Zi-O, Build
 * Form used:
 * BuildArmor

Theme song
The theme song for the film is Everlasting Sky, performed by Beverly, who also performs the show's main theme song, Be the One. The chorus was first played at the press conference for the film and other subsequent press conferences for the film alongside .

Errors

 * to be added