In Fuuto, better known as the Windy City, mysterious beings called Dopants wreak havoc by using the dangerous Gaia Memories. However, there are also heroes who utilize the Gaia Memories to fight these criminals: a half-boiled and indecisive PI named Shotaro Hidari, and his partner Philip, an intellectual-type PI. The two transform into Kamen Rider W-the legendary hero of Fuuto city!
