Their debut song as a band is Powerful Beat and so far, this is the only song they have been seen performing.
The Rainboys started their band for a band contest that was being held in Dream Town and competed along with the Kira Kira Girls and the Pretty Princesses. Neither they or their rivals won, but everyone still enjoyed it. The Rainboys stopped when the Kira Kira Girls broke up and Yumemtchi and Kiraritchi left to study to be idols. However, when Dream Town and TamaTown fused, the Kira Kira Girls held a revival concert and, along with the Rainboys and the Pretty Princesses, began performing once again.