Under the impression that they saved the World of Den-O, Tsukasa Kadoya (Kamen Rider Decade) 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. As this occurred, the Tarōs mysteriously vanish from the DenLiner as they are about to help Kotaro Nogami (Kamen Rider New Den‑O) out with the true threat to their world.

Super Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship

Wasao, an Akita dog in Aomori Prefecture that became famous as an ugly-yet-cute dog from a traveller's blog. Heartwarming drama starring Wasao himself turns part of the life of this former stray into an original story. Setsuko, who runs a grilled-squid shop in a fishing village at the foot of the Shirakami mountains, decides to take in a large dog with a long, unruly fur that has shown up in town. She names the dog Wasao and showers it with affection, but Wasao at that time doesn't take to Setsuko.