25 years before Ikki, Daiji, and Sakura were born, a dying and critically injured man was brought into Noah, a scientific research organization. That man, Junpei Shiranami, was given a heart transplant by Masumi Karizaki and recovered. He is then given the Vail Driver and forced to become a powerful demon hunter. Junpei, whose parents were killed by demons, becomes Kamen Rider Vail with revenge in his heart that drives him to fight...