Plot - Cho Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship
Cho Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship is a Japanese superhero Tokusatsu crossover film between Kamen Rider Den-O, Kamen Rider Decade and Kamen Rider Kiva, and the first film to be part of the Cho Den-O Series.

Cho Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship
In the film, Tsukasa assists the DenLiner crew in correcting an alteration in the timeline.
Plot Cho Kamen Rider Den-O & Decade NEO Generations: 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 a manuscript that detailed the legendary Oni Conquest with Momotaros’ image on it.

Cho Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship 2009
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.

Cho Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship English sub
Meanwhile, in the 1980s, a boy named Yu encounters Mimihiko and then Yu is possessed by Deneb who gets him away from the Gelnewts before New Den-O arrives to cover his escape.

Watch online Cho Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship
Deneb then brings Yu to Ryotaro, revealing Mimihiko to be one of the Oni of legend and is searching for the Demon’s Trump Card which Yu possesses. Seeing Yu reluctant to give them the item,