There was an open audition for the six roles in Sentimental Graffiti. There were 1428 applicants, out of which 20 were selected as finalists. The final audition was held on 1997.01.19 (some parts of which can be seen on Sentimental Graffiti First Window ), and these six girls where chosen for the roles.
The Usagi Gumi is a "sub-group" of the SG Girls.
The Usagi Gumi have sung songs on their respective solo albums, and other Sentimental Graffiti related CDs.
The Usagi Gumi had a weekly Internet radio show Tsukiyo no Usagi Gumi between 1998.03.31 and 1998.10.01.