Build NEW WORLD: Kamen Rider Grease

Plot Build NEW WORLD: Kamen Rider Grease

Build NEW WORLD: Kamen Rider Grease is a Japanese superhero film that serves as the second installment of the Kamen Rider Build NEW WORLD series of V-Cinema films set within the continuity of Kamen Rider Build. The film focuses on the character of Kazumi Sawatari as he faces a terrorist organization that threatens to conquer the world. A romantic-comedy special titled I Heard the Idol Otaku is Dating His Fav was released alongside the film, which takes place shortly before the events of the film.

Build NEW WORLD: Kamen Rider Grease

In the final chapter of Kamen Rider Build, set in the new world created by Sento Kiryu, United Nations deputy Simon Marcus leads a terrorist organization called Down Fall in his quest to conquer the world. With the help of guinea pig-turned-mad scientist Keiji Uraga, they attack the Kamen Riders with overwhelming strength and kidnap Misora Isurugi. Kazumi Sawatari, also known as Kamen Rider Grease, is the only one strong enough to fight Down Fall. Sento creates a new item for Kazumi that encompasses the power of the Hokuto Sanbagarasu, but at the cost of their lives. The ultimate decision must be made.

Build NEW WORLD: Kamen Rider Grease

Kazumi is gleefully watching Misora work when she suddenly asks him to go out with her. Believing it to be a date, he puts on a suit and goes shopping with her, but is heartbroken when he learns that she only wanted him to help her find a present for her dad (although she leaves him with a gift, a free carabiner they had received while shopping). Frustrated & humiliated, Kazumi and the Sanbagarasu take an inflatable raft and go on an adventure, only to end up stranded on a remote island.

Build NEW WORLD: Kamen Rider Grease

At the central government office, Taizan Himuro and Gentoku Himuro meet with Simon Marcus, United Nations deputy officer, to discuss security measures should another Killbus incident happen. Gentoku takes Marcus to the lab, where he and Shinobu Katsuragi present the new Build Driver, created from Shinobu’s memories from the previous world. They are ambushed by Down Fall, who are supported by hacked Guardians; Keiji Uraga introduces himself as Down Fall’s leader. Gentoku transforms into Kamen Rider Rogue and escapes the ambush with the Build Driver, only for Marcus to reveal himself as the leader of Down Fall; Marcus transforms into a Phantom Crusher, powered by Phantom Liquid, and defeats Rogue before draining him of the Nebula Gas that maintains his Kamen Rider form. Uraga takes the Build Driver and shoots Gentoku.

Build NEW WORLD: Kamen Rider Grease

Earlier, Utsumi had arrived at Sento’s hideout to raise his Hazard Level in a Nebula Gas capsule. After Down Fall’s invasion of the central government office, Sento and Banjou are ambushed by a member of Down Fall, who transforms into a Phantom Crusher. Sento and Banjou transform, only to be defeated when the Phantom Crusher absorbs their forms. The Phantom Crusher takes the Hazard Trigger and white Pandora’s Box panel and leaves.

Build NEW WORLD: Kamen Rider Grease

Meanwhile, Kazumi and the Sanbagarasu wash ashore on the coast of Japan. Kiba leads them to something sinister-smelling, later revealed to be a hot spring. They encounter a Down Fall member on their way home and transform to fight him; the Down Fall member fails to absorb their transformations and is forced to flee. Kazumi receives a call from Gentoku, who is being held hostage by Uraga. Kazumi is told to come to the lab, but sensing that Gentoku is in trouble, heads to Sento’s lair instead. Uraga discovers that the white panel retrieved from Sento’s lair is fake and kills the Down Fall member that brought it to him.

Build NEW WORLD: Kamen Rider Grease

At the lair, Sento asks Kazumi where he’s been and how he can maintain his transformation, but Kazumi only has Misora’s rejection distracting his mind. Akaba mentions the hot spring they discovered, which piques Sento’s interest. Sawa calls Sento, revealing that Gentoku had called her to allow her to listen in on Uraga’s speech; Sento learns of the Phantom Liquid and Phantom Crusher. Sento, Banjou, and Sawa head to Takumi Katsuragi’s lab while the Hokuto Three head out to act as Misora’s bodyguards. Kazumi stays behind at the laboratory continuing to feel sorry for himself.

Build NEW WORLD: Kamen Rider Grease

At work, Misora is ambushed by Uraga and several Guardians. The Hokuto Three transform into Smashes to defend her, only for Uraga to use the stolen Build Driver & Hazard Trigger to transform into Kamen Rider Metal Build. Meanwhile, Kazumi heads to a park to think; he discovers the gift that Misora had given him earlier in his pocket. Metal Build easily defeats the Hokuto Three, but Kazumi interrupts as Kamen Rider Grease; he, too, is defeated by Metal Build, who takes Misora hostage with the real Pandora’s Box white panel as ransom.

Build NEW WORLD: Kamen Rider Grease

At the former’s lab, Katsuragi and Sento theorize that Kazumi and the Hokuto Three were able to maintain their forms because the hot spring they had rested in was actually a spring of Phantom Liquid. Sento devises a new power-up item that harnesses the power of Phantom Liquid; Kazumi requests that it be made for him. Marcus questions why he brought Misora with them, but Uraga kills him, taking over Down Fall in the process.

Build NEW WORLD: Kamen Rider Grease

As Kazumi grieves over his failure to protect the Three, Sento presents him with Perfect Kingdom, the new power-up item that harnesses the power of the Phantom Liquid. However, it is still lacking in Phantom Liquid; to complete it, the Phantom Liquid must be extracted from the bodies of the Hokuto Three at the risk of their lives, a risk Kazumi is unwilling to take. After Kazumi leaves, the Hokuto Three regain consciousness and offer to sacrifice themselves to finish Perfect Kingdom, to Sento’s horror.

Build NEW WORLD: Kamen Rider Grease

The next morning, Uraga announces Down Fall’s conquest of Japan on a televised broadcast as their Guardians, Smashes, and Phantom Crushers take to the streets. Kazumi takes the white panel to the central government office, challenges the occupying Down Fall to a battle for the white panel, and transforms into Grease Blizzard. Meanwhile, the Phantom Liquid extraction process is completed, alongside Perfect Kingdom. Sawa rescues Gentoku, who is still tied up in the basement, and feeds him the extracted Phantom Liquid. Meanwhile, Sento retrieves Utsumi from the Nebula Gas capsule.

Build NEW WORLD: Kamen Rider Grease

At the central government office, Kazumi (as Grease) is tearing through Smashes and Guardians one-by-one. Uraga transforms into Metal Build and attacks him; Grease is able to knock him down for a finisher, but he is interrupted by a Phantom Crusher and is instead put on the receiving end of Metal Build’s Hazard Attack, causing him to drop the white panel. Metal Build acquires the white panel and absorbs it, transforming into Phantom Build. Uraga, as Phantom Build, easily defeats Grease Blizzard, ejecting him from his transformation. Before Phantom Build (alongside his Guardians and Smashes) can finish him off, however, Banjou arrives and hands Kazumi the Perfect Kingdom along with the Hokuto Three’s dog tags. Taking them, Kazumi resolves to fight. They are joined by Sento, Utsumi, and Gentoku, and they all transform into their respective final Kamen Rider forms; Kazumi transforms into Grease Perfect Kingdom. Banjou (as Cross-Z Magma) goes to save Misora while Kazumi (as Grease Perfect Kingdom) fights Uraga (as Phantom Build) and the others fight the Guardians, Smashes, and Phantom Crushers.

Build NEW WORLD: Kamen Rider Grease

Kazumi is defeated by Phantom Build, but after delivering a rousing speech about his role as a Kamen Rider, he is able to stand up and fight once more. He defeats Phantom Build with a Perfect Kingdom Finish. Phantom Build disappears, leaving behind the white Pandora’s Box panel.

Build NEW WORLD: Kamen Rider Grease

After the battle, Misora thanks a wounded Kazumi for saving her. He mourns the Hokuto Three one last time, only for them to arrive and celebrate his victory; they had survived the Phantom Liquid extraction process. Akaba explains that Sento had deliberately lied about their survival to raise Kazumi’s Hazard Level; in response, Kazumi cries, “Damn you, Devil’s Scientist!”

In Sento’s lair, Gentoku reveals that Takumi Katsuragi had returned to the laboratory at the central government office, and that he and Sawa were dating. Utsumi appears to express disdain for him being a cyborg in the previous world and attempts to break a metal bar over his knee like he did in the previous world; unable to break it, he instead proclaims that it is the ‘unbreakable Nanba cane.’

Kazumi gleefully watches Misora work once again. She asks him out on a date again, this time explicitly stating her interest in him.