is an annual event in the Japanese idol group, Hello! Project that started in 2000. The idea was to shuffle up the existing Hello! Project groups and soloists (e.g. Morning Musume, Country Musume, Aya Matsuura, Melon Kinenbi, and others) into one of three groups for a season-long collaboration to see which shuffle group can sell the most singles. Each year's shuffle has a common theme: 2000's shuffle group theme, for example, was color and the groups were Akagumi (red) 4, Kiiro (yellow) 5, and Aoiro (blue) 7. Despite the commonality in theme and same B-side song, each group tends to sing a different style A-side song (details below). Eventually, this became more of a tradition than a competition to outsell; in 2003 the three groups' songs were merged and sold as one single/mini-album. In the fall of 2004, only one unit was formed of all 46 current Hello! Project singers collaborated to sing the song "All for One & One for All!". The three sh