Like the first two Movie War films, Movie War Ultimatum is split into three parts. The first part is Kamen Rider Fourze's place five years after the events of the series. Gentaro is now a teacher at Amanogawa High as well as the Space Kamen Rider Club's new academic advisor, Yuki becoming an astronaut, Kengo working as a scientist at Kyoto University like his father, Miu becoming a model, Shun becoming a professional football player, JK working for a magazine, Tomoko as a novelist, and Ryusei becoming an agent of Interpol with Inga Blink.
However, a group of psychic children known as the Monster Alliance (怪人同盟, Kaijin Dõmei ? ) led by a student named Sanro Fuda who becomes a mutant known as Sanagiman (サナギマン, Sanagiman ? ),supported by a mysterious man named Kagehito Banba,threaten the school. The second part is Kamen Rider Wizard's portion, where Haruto enters the Underworld to investigate the mysterious occurings of monsters appearing. He then runs into a young woman named Yu Kamimura who can become Bishõjo Kamen Poitrine (美少女仮面ポワトリン, Bishõjo Kamen Powatorin ? ) who can use magic similar to Kamen Rider Wizard. The third and final part of the film is Movie War Ultimatum. The Akumaizer (ア クマイザー, Akumaizã ? ) ,composed of the leader Xatan (ザタン, Zatan ? ),the swift Eel (イール, Īru ? ),and the brutish Gahra (ガーラ, Gāara ? ),revive army of Yummy, Dopants and other monsters from the Underworld to invade the land of the living. Kamen Rider Wizard and Kamen Rider Fourze, along with the help of Kamen Rider Meteor, Kamen Rider Nadeshiko, Kamen Rider OOO, Kamen Rider Birth, Kamen Rider Double,and Kamen Rider Accel,to stop the Akumaizer and their Monster Army.
