Super Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship (2009) on Netflix

Plot summary

Aboard the DenLiner, the Tarōs vanish just as they are needed to help Kotaro Nogami face the true threat to the World of Den-O. In 1980, a boy named Yu meets Mimihiko, is briefly possessed by Deneb, and is carried clear of the Gelnewts before New Den-O arrives. Deneb takes Yu to Ryotaro, who learns that Mimihiko belongs to the Oni of legend and is hunting an item the boy keeps. Ryotaro leaves Yu a DenLiner admission ticket; Yu later brings the Trump Stone aboard and asks to stay, though the Owner warns him the crew means to return to the past and fight the Oni. In the Muromachi period, Toki guards the Trump Stone with her archery. Tsukasa Kadoya and his companions, meanwhile, are stopped by Sieg and a manuscript of the legendary Oni Conquest.