W (Double U) was a duo formed by the "twins" of Morning Musume, Kago Ai and Tsuji Nozomi. Known for their fun loving ways and deep friendship, the two performed mainly covers of female duos from the 60s through to the 80s. It was generally customary throughout the duo's existence for them to perform in matching outfits and with their flawless harmonies it was easy to see how the misconception of the pair being related came about.