Three of the members of Def.Diva (Goto, Abe, Ishikawa) were previous Morning Musume members, while Matsuura is a soloist. Goto, Matsuura and Abe also comprised a previous three-member special group, Nochiura Natsumi. The four were joined together in September 2005 to form Def.Diva.
After Maki Goto's graduation from Hello! Project in October 2007, the group made no more releases. All of the three remaining members graduated with the rest of the Elder Club on March 31, 2009, leaving the group empty and on indefinite hiatus.
Aya Matsuura (Soloist; graduated from Hello! Project in March 2009)