Hitomi Yaida 矢井田瞳 (Yaida Hitomi, born July 28, 1978, in Toyonaka, Osaka) is a Japanese pop/folk rock singer-songwriter and guitarist. She often goes by the nickname Yaiko. Her musical style is often called "heart rock" by her fans. Yaida is an established musical artist in Japan and has also had minor club hits in the United Kingdom.