On June 17, 2007, Sugiura married Nozomi Tsuji while she was three months pregnant; the marriage was confirmed to be a shotgun wedding.
On April 24, 2007, it was announced that Sone would form a singing group directed by Tsunku named Gyaruru with Nozomi Tsuji and Ami Tokito.
On the August 14, 2009 broadcast of Music Station, original Morning Musume members Yuko Nakazawa, Kaori Iida, Mari Yaguchi, Rika Ishikawa, Hitomi Yoshizawa, Nozomi Tsuji and Asami Konno did a special performance as backing dancers in a collaboration with the current members.