Haruko Momoi 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.

Nurse Witch Komugi is an original video animation (OVA) anime series co-produced by Tatsunoko Productions and Kyoto Animation. The series lasted for five episodes, all of which were released on DVD in North America by ADV Films. A two-episode long sequel OVA series was created, Nurse Witch Komugi-chan Magicarte Z.