Rainbow Pink (レインボーピンク) was a collaboration between Morning Musume members Michishige Sayumi and Kusumi Koharu. The duo is credited for three songs that were put in Morning Musume albums, and also performed during concerts for Morning Musume. The group officially disbanded when Kusumi Koharu graduated in 2009.
- [2006.02.15] Rainbow 7 (レインボー7) (#6 Rainbow Pink)
- [2006.12.13] 7.5 Fuyu Fuyu Morning Musume Mini! (7.5冬冬モーニング娘。ミニ!) (#6 Wa ~ Merry Pin Xmas!)
- [2007.03.21] SEXY 8 BEAT (#10 Takara no Hako)
- During the Morning Musume Concert Tour 2011 Haru Shin Souseiki Fantasy DX ~9ki Mem wo Mukaete~, Rainbow Pink's signature song "Rainbow Pink" was performed with Ikuta Erina replacing Kusumi Koharu.
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