The Dekarangers respond to a disturbance in the city. On arriving, they find the area under attack from three brightly-coloured people. They fight them but they steal Machine Bull to chase a crow, which is apparently their enemy. They crash and are arrested by the Dekarangers. At DekaBase, the Dekarangers discover that their prisoners are Bakuryuu Sentai Abaranger.
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.
Misaki Kanon is a young woman who comes to the big city with dreams of becoming a singer. At first everything goes well, she falls in love and works towards her dream. But then her boyfriend betrays her and Kanon loses her faith in people and sight of her dream. Once upon a time, as a small child in a remote mountain village where the Daimajin rests, she sang the song of prayer. Now she has to regain her song to find herself and maybe save the world too. A mysterious man from the village is searching for her so that she may help him and his comrades when the time comes.
