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Retired Yakuzas open a ramen restaurant and become an overnight sensation, thanks to their recipe developed in prison. But a mysterious upstart gang is taking down every Yakuza family one by one, drawing the chefs back into the gangland underworld once more!
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A história começa seguindo a batalha de Ex-Aid e Para-DX contra Build durante Kamen Rider Ex-Aid: True Ending. Build aparece e tira os poderes da Ex-Aid, mas Sento não se lembra de que esse incidente acontece, pensa que é um sonho. Misora fez dois novos Fullbottles. Quando Sento chega a um lugar chamado de Smash, ele encontra um Nebula Bugster, a última mutação do vírus Bugster. Enquanto Sento luta contra o Nebula Buster, Ryuga é exilado em uma realidade alternativa, onde a parede do Sky Wall existiu, onde conheceu o Emu e os Gamer Riders. Os riders do mundo de Build e os riders do mundo de Ex-Aid, ao lado dos lendários Riders: Fourze, OOO, Gaim e Ghost enfrentarão essa ameaça!
Original Music Composer
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!
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* Based on a shounen manga by Shiina Takashi, serialised in Shounen Sunday. The children enter a junior high school. One day, they receive an emergency contact that B.A.B.E.L. (Base of Backing ESP Laboratory) is attacked.