Yumi Nakashima (中島優美, Nakashima Yumi?, born December 1, 1979) is a Japanese vocalist, guitarist, singer-songwriter. She is a guitarist, vocalist and composer of Japanese rock band GO!GO!7188 under the name; Yuu (ユウ?). She is also a songwriter, composer, guitarist and vocalist of her side band Chirinuruwowaka. On March 1, 2004, she released solo album Ten no Mikaku under the name; Yuu (ゆう?).