History Recap / KamenRiderBuildNEWWORLDKamenRiderGrease

Sometime after the incident involving Killbas, Kazumi was asked to accompany Misora, which caused an overreacting response from Kazumi with his delusion in Misora's new Nascita site of working by van. As Kazumi accepted, Kazumi wore a tuxedo on the next day and accompanying Misora for shopping until night. At night before Misora left Kazumi, Kazumi gave Misora a present which contained Misora's suit from the old world as a net idol. It disgusted Misora and she rejected Kazumi when he confessed his feelings, especially since Kazumi had misinterpreted accompanying with 'dating' (in Japan, 'tsukiate' commonly means as accompanying, but also means 'dating' in romance term). This frustated Kazumi and the Hokuto Three Crows group came to cheer him up Kazumi came up with the conclusion to go sailing together and they sailed without any proper direction with a rubbery boat and got lost on an unknown island.

Days after that, Taizan had a meeting with Simon Marcus, a deputy officer of the United Nations with Gentoku was with Taizan as the translator due to Simon speaking in English. They talked about the security means for the future should there be the next threat like Killbas, especially the current new terrorist group which is called Down Fall. Taizan and Gentoku led Simon to the lab, introducing Guardians while on the way and the latter the Build Driver which was created by Shinobu Katsuragi. However, none of them realized that Guardians were hijacked on their way to the lab after their introduction. Soon after the introduction of Build Driver, the groups were ambushed by the Down Fall. Gentoku, Taizan, and Shinobu were shocked that Guardians were also working with the Down Fall, noticing that they were hacked. Simon Marcus calmly introduces himself as the leader of the Down Fall group and they wanted to take over the facility in Japan so Down Fall will rule the world. Gentoku transformed into Kamen Rider Rogue to fight, not before he dialed a phone call and set it into loudspeaker mode and easily overpowered the Guardians. However, Simon transformed into a Phantom Crusher and made a surprise attack on Gentoku, damaging him badly with the heavy power shot and made him fell onto the escalator. Simon stepped on Gentoku and used a mysterious bottle to absorb Gentoku's Nebula Gas, forcing him to de-morph much to his dismay.

* DarkerAndEdgier : While the movie still have the overall comedic tone, it managed to cranked it UpToEleven much darker with '''on-screen straight up murder '''at two separate scenes!

* ButNotTooForeign: Simon Marcus is played by half-Japanese American actor Micheal Tomioka. [[spoiler:He's also better at Japanese than he seems to be at first.]]

* DarkerAndEdgier : While the movie still have the overall comedic tone, it managed to cranked it UpToEleven much darker [[spoiler: with '''on-screen straight up murder '''at two separate scenes!]]

* DisappearsIntoLight: [[spoiler:Keiji's fate after getting killed by Kazumi.]]
* DragonInChief: [[spoiler:Simon Marcus]] is actually second to [[spoiler:Keiji Uraga]], before the later steps up.
* EleventhHourSuperpower: [[spoiler: Kazumi received Grease Perfect Kingdom from Ryuga after the supposed HeroicSacrifice of the Hokuto Trio to create it.]]

* {{Repower}}: The Build Riders get their powers back in the last act once Sento and Takumi successfully manage to create tonics based on Phantom Liquid. Utsumi also gets to enter the fray against Downfall after having his Hazard Level restored [[spoiler: once Sento remembers to retrieve him from the gas chamber after spending most of the movie forgetting Utsumi was there]].

* TakeALevelInBadass: Aside from [[SuperForm Perfect Kingdom]], Kazumi and the Three Crows accidentally get a power boost from a hot spring they found after they got lost at sea. This allows Kazumi and the Three Crows to transform despite having their original Nebula Gas essences stolen by the Phantom Crushers [[spoiler: and later lets Kazumi use Grease Blizzard without the risk of death]]. [[JustifiedTrope Justified]] in that it turns out the spring happens to be a concentrated spot of Phantom Liquid.
* ThrowTheDogABone: After endlessly getting rejected by his crush, [[spoiler:Kazumi finally has his love requited by Misora.]]

* ButNotTooForeign: Simon Marcus is played by half-Japanese American actor Micheal Tomioka. [[spoiler:He's also better at Japanese than he seems to be at first.]]]