Nozomi Tsuji
Sone appeared in two karaoke television programs in late 2006. On one show, she ate sushi quickly during an instrumental section of her song. 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 May 14, 2007, after Tsuji's resignation from the band, Asami Abe joined in her place. Their first single, , was released on June 20, 2007 on Japanese independent label TN-mix through Pony Canyon. Sone's nickname in Gyaruru is Sonene.