Kiiro 5 (黄色5) was one of three special "shuffle units" from Hello! Project in the spring of 2000, the first year H!P introduced their annual shuffles. The shuffle theme was primary colors. They released only one single, "Kiiroi Osora de Boom Boom Boom" (黄色いお空でBOOM BOOM BOOM; "Boom Boom Boom in the Yellow Sky") which included their version of a c/w song that was shared by all three shuffles. True to their name, they had five members selected from Morning Musume (Natsumi Abe and Kei Yasuda) Read more on Last.fm