Iku is a Japanese singer who was signed to NBCUniversal Entertainment Japan. She debuted in 2008 with the single "Oto no nai Yozora ni/Ko no Me Kaze", produced by the music production group I've Sound. She worked with them only as a guest vocalist initially and the partnership lasted until 2009, when her first album came out, however, in 2014, she officially joined the group.