Cho Kamen Rider Den-O & Decade Neo Generations: The Onigashima Warship (2009)

Cho Kamen Rider Den-O & Decade Neo Generations: The Onigashima Warship 2009 / 劇場版 超・仮面ライダー電王＆ディケイド ＮＥＯ ジェネレーションズ 鬼ヶ島の戦艦 2009 / Super Masked Rider Den-O & Decade Neo Generations The Movie: The Onigashima Warship

Taking place after the events of Kamen Rider Decade episode 15, under the impression that they saved the World of Den-O, Tsukasa Kadoya and company begin their journey to the World of Kabuto when they are halted by Sieg who presents them with a manuscript that detailed the legendary Oni Conquest with Momotaros' image on it. As this occurred, the Tarōs mysteriously vanish from the DenLiner as they are about to help Kotaro Nogami out with the true threat to their world.