All Kamen Riders are set to battle against unknown enemies and compete with each other in survival games named Desire Grand Prix. Only true heroes who win the competition will be granted the right to bring their ideal world to life.

Set in a high school senior class where students can now marry without parental consent due to the implementation of the new "18-year-old adulthood" law, this unprecedented school suspense drama explores first love, pregnancy, marriage, and even infidelity. Not only are the students of Class 3-C involved in affairs, but so are their parents and teachers...!? The protagonist of this work is Uemura Aoi, who transfers into Class 3-C at an elite high school after her parents get divorced due to her father's affair. The story depicts how she reunites with Tachibana Iori, a male student who was her first love and is now married to another classmate, and how they fall into an illicit affair. Their romance eventually spirals into a scandal that engulfs the school and their parents, leading to a gruesome tragedy.