Kamen Rider Den-O & Kiva: Climax Deka (劇場版 仮面ライダー電王＆キバ クライマックス刑事（デカ） Gekijōban Kamen Raidā Den'ō ando Kiba Kuraimakkusu Deka) is a Japanese superhero crossover film between Kamen Rider Den-O and Kamen Rider Kiva.
It opened in theaters on April 12, 2008 as part of the Kamen Rider Spring Festival (春の仮面ライダー祭 Haru no Kamen Raidā Matsuri). In its first weekend, it took the top spot at the Japanese box offices, unseating the Japanese release of Cloverfield. In the end, it grossed 730 million yen, over double the normal revenue for a Kamen Rider film.
Set after the events of Kamen Rider Den-O, Ryotaro and the DenLiner gang have set up a detective agency called the DenLiner Police (デンライナー署 Denrainā Sho) who seek to keep the Imagin that survived the Junction Point in check after an Imagin stole a spare Den-O Pass from Owner while he was training. While pursuing the Pink Rabbit Imagin via car chase, they cross paths with the Horse Fangire as Den-O and the Tarōs battle them, killing the two monsters and not finding the Den-O Pass on either. Soon after, the DenLiner Police are joined by detective Kazuya Suzuki, who tells them of an "Evil Organization" that is making itself known in the criminal underworld. After R-Ryotaro's "arrest spree", Ryotaro and Kazuya encounter Wataru Kurenai and Shizuka as they are suspiciously digging up items for a new violin varnish. After a small spat with U-Ryotaro and an unintentional possession of Wataru by Momotaros, Ryotaro and Kazuya locate the base of the Evil Organization after Wataru tips them off. There, before being chased out, they find Yuto with the organization's leader, the Imagin Negataros, and a man that Kazuya recognizes as wanted criminal Seiya Kuroki. Acting on his own, Kazuya attempts to arrest Kuroki, only to be ambushed by the Clown Imagin. However, with a drunk Deneb and Naomi as a distraction, Yuto, who has been working incognito, attempts to free Kazuya. Before he can ambush Sarah with a metal bat, he is possessed by Urataros who manages to successfully woo her and wrest the gun away. Yuto kicks Urataros out as he fights her and the Clown Imagin as Kuroki arrives, with K-Ryotaro providing backup. Negataros takes his leave while activating the detonation device with everyone making it out.
At the DenLiner, after Kazuya apologizes for almost getting everyone killed and explaining his reasons to be avenging his father Kazuma, Yuto reveals Negataros's plans. Despite telling them that he's too strong, the DenLiner Police decide to attack at full strength together. The next day, Negataros begins to set his plan in motion with Kamen Riders Den-O and Zeronos, along with their Imagin partners, standing in his way while Suzuki arrests Kuroki after the DenLiner takes him and his posse away from the fight. However, Negataros uses the Den-O Pass to become Nega Den-O as the fight begins. As the Tarōs deal with the Fangires, Zeronos battles the Clown Imagin while Den-O dukes it out with Nega Den-O. Nega Den-O easily gains the upper hand against all four Den-O forms, but before he can finish him off, Kamen Rider Kiva arrives to turn the tables as Den-O Climax Form joins him in a Double Rider Kick. The impact forces Negataros out of his Rider form. Refusing to accept defeat, Nega Den-O escapes in the Nega DenLiner with DenLiner and ZeroLiner in pursuit. Castle Doran joins the fight as all three giants destroy the Nega DenLiner, taking out Negataros for good. Soon after, Ryotaro takes Kazuya to 1986 to see Kazuma as he was interviewing Otoya on an investigation, giving the young detective closure. Though they succeeded in their mission to stop Negataros, Momotaros decides to keep the DenLiner Police going as he considers being a cop a cool thing. After they succeed in cornering a couple of crooks, Deneb attempts to ask for Yuto to join the DenLiner Police, failing to see the crooks they cornered escape with the DenLiner Police and Yuto chasing after them.
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