During late October and early November 2009, DSP Media released daily teasers in the form of pictures of Rainbow, and then a music video for "Gossip Girl" on November 6, 2009.
On November 12, the five-song EP Gossip Girl was released.
On August 12, 2010, Rainbow released the single "A".
A second single, "Mach", was released on October 20.

In April 2011, Rainbow released their second EP, So Girls.
One song from the EP, "To Me", was released as a single.
On September 7, 2011, Rainbow topped Recochoku's weekly download rankings for the Japanese release of their "A" music video.
On September 14, 2011, Rainbow released their debut single in the Japanese market, "A", and reached No.
3 on Oricon's daily single chart, selling 10,141 copies.
The single release included a Japanese remake of their debut single "Gossip Girl", as well as an exclusive DVD.
Rainbow made their Japanese TV debut on the show Sukkiri, performing "A".
On December 7, 2011, the group released their second Japanese single, a Japanese version of the song "Mach" (Japanese: マッハ), and reached No.
9 on Oricon's weekly chart.
During late October and early November 2009, DSP Media released daily teasers in the form of pictures of Rainbow, and then a music video for "Gossip Girl" on November 6, 2009. On November 12, the five-song EP Gossip Girl was released. On August 12, 2010, Rainbow released the single "A". A second single, "Mach", was released on October 20.
In April 2011, Rainbow released their second EP, So Girls. One song from the EP, "To Me", was released as a single. On September 7, 2011, Rainbow topped Recochoku's weekly download rankings for the Japanese release of their "A" music video. On September 14, 2011, Rainbow released their debut single in the Japanese market, "A", and reached No. 3 on Oricon's daily single chart, selling 10,141 copies. The single release included a Japanese remake of their debut single "Gossip Girl", as well as an exclusive DVD. Rainbow made their Japanese TV debut on the show Sukkiri, performing "A". On December 7, 2011, the group released their second Japanese single, a Japanese version of the song "Mach" (Japanese: マッハ), and reached No. 9 on Oricon's weekly chart.
Rainbow (group)