The World of W is the main setting of the story take place. The world is belong to Kamen Rider Double's World. In this world, The Museums had eliminated 60% of the Humanity and 40% of the Humans are hiding out. Shotaro Hidari and Phillip together with the Narumi Detective Agency and F.C.P.D ( Futo City Police Departement ) fight the Dopants menace for good.