Koji Igarashi (五十嵐 孝司, Igarashi Kōji?), also known simply by the nickname IGA, is a Konami employee and one of the producers of the Castlevania video game series. He is best known as the assistant director of Castlevania: Symphony of the Night, his first major involvement in the Castlevania series (he was partially involved in Akumajō Dracula X Chi no Rondo and is listed under "Special Thanks" in the ending credits). He served as producer between Castlevania Chronicles and up until Castlevania: Harmony of Despair. He has been involved in other titles such as the Japan-only RPG Elder Gate and Nano Breaker.