Haruko Momoi (桃井 はるこ Momoi Haruko, born December 14, 1977) is a Japanese singer, songwriter and voice actress. She also produces an all-female pop group called Afilia Saga. She was born in Tokyo, Japan and is affectionately referred to as Halko by her fans, a nickname she gave herself which is inspired by HAL 9000, the computer in the film 2001: A Space Odyssey.