Hitomi Yaida (矢井田瞳, born July 28, 1978), also known by the nickname Yaiko, is a Japanese folk rock singer-songwriter and guitarist from Toyonaka, Osaka, Japan. She plays a kind of quirky vocal-centric rock akin to REBECCA, Nokko or 椎名林檎. Yaida, who refers to her music as "Heart Rock", is also able to play most of the instruments she composes for, and after a stint on the indie scene where she had a hit titled Howling off a demo tape in 1999