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.

Eiji and Ankh team up with Kotarou and Momotaros as they travel back in time to 1971 aboard the Den-Liner to stop three Mole Imagin. But Ankh’s desire to obtain Core Medals while in the past sets off a chain of events that alters the 40-year history of the Kamen Riders by allowing Shocker to take over the world. It’s up to OOO and New Den-O to restore the timeline!

When Ryotaro and Momotaros are injured in a fight with an Imagin, Kotaro, Kamen Rider New Den-O, and his Imagin partner Teddy return to help solve the case of a stolen ticket and the mystery of a young woman’s doppelganger! But Owner shatters their partnership when he creates a new contract with Teddy, as the Mantis Imagin rampages! Can Kotaro overcome his loss and discover the truth behind the two Mikus?

With the older Sakurai having sacrificed himself to ensure Airi’s future, Yuuto struggles with his own role in their story. Despite being told that he is no longer bound to his future, Yuuto finds himself continually drawn to Airi, and when another man contracts with an Imagin to woo her, Ryotaro and the Imgain are pulled into the situation, all while the DenLiner runs out of control through time!

DVD release of the final talk show from sci-fi live action series Kamen Rider Den-O includes footage from the January 26 and 27, 2008 shows at Nakano Sun Plaza.