Inspector Sugishita Ukyo from the Tokyo Metropolitan Police Department’s Special Missions Unit makes brilliant deductions and cracks difficult cases with his partner Kaburagi Wataru who used to be a career bureaucrat from the Ministry of Justice.
Amanogawa High School has become the center of strange happenings, and things only get stranger when the bad boy styled transfer student Gentaro Kisaragi attempts to make friends in his own unique way, reuniting with childhood friend and self-professed space travel otaku Yuki Jojima, all while gaining the ire of loner Kengo Utahoshi. When the campus becomes overrun with monstrous constructs called Zodiarts, Kengo and Yuki attempt to use the strange devices they have found in the Rabbit Hatch lunar base that they access through a locker on an off-limits part of campus to fight them. However, Gentaro interferes in their plans, in part due to Kengo's body unable to handle the strains of battle, and uses the devices to transform into Fourze. Upon learning of other heroes called Kamen Riders, Gentaro creates the Kamen Rider Club whose membership includes Yuki, Kengo, the school's queen bee Miu Kazashiro, Miu's jock ex-boyfriend Shun Daimonji, garishly styled social butterfly JK and goth girl Tomoko Nozama. Later joined by Ryusei Sakuta, a transfer student who transforms into Kamen Rider Meteor, and their teacher Mr. Chuta Ohsugi, the Kamen Rider Club and Kamen Rider Fourze learn of the Horoscopes, an evolved group of Zodiarts who have been orchestrating events on the school grounds to build up their ranks. As the battle escalates, the Horoscopes sets their motions to their final phase of their master plan before Kengo discovers his true existence.
Inspector Sugishita Ukyo, head of the Special Missions Division, returns from London and goes home in the sports car of Assistant Inspector Kanbe Takeru, who has come to meet him at Narita Airport even though Ukyo did not ask him to. However, on the way home, Ukyo notices police officers from the Metropolitan Police Department conducting a crackdown outside the agency’s jurisdiction in Chiba Prefecture and gets suspicious. The police officers that Ukyo had seen were riding motorcycles. He lies in wait in a street with a dead end, but the motorcycle police have vanished into thin air. Ukyo is mystified and begins a thorough investigation. The Head of the National Police Agency’s Secretariat, Onoda Koken, appears before Ukyo, who has a bad feeling about what is going on. He tells Ukyo that Honda Atsuto, a revolutionist and senior leader of the leftist radicals “Red Canary”, has secretly returned to Japan.