It follows a group of people who are still living in temporary housing 12 years after a natural disaster called "Nani" destroyed their town.
Before the birth of the Igarashi children... A dying and seriously injured man was brought to the scientific research organization Noah. The man, Junpei Shiranami was transplanted with Giff's cells into the heart by Masumi Karizaki and survived. He was forced to become the strongest Devil hunter and given the Vail Driver. Junpei, whose parents were killed by the red Devil, becomes Kamen Rider Vail with revenge on his mind, continuing to fight the Devil...
The Igarashi siblings travel to the forbidden Area 666 to rescue airjacking victims (including their parents!) from the dangerous criminal known as Azuma, who wishes to judge the fate of humanity himself.
