The daughter of Joseph Joestar and Suzie Q, and mother of Joutarou Kuujou. Formerly Holy Joestar, she moved to Japan at some point in time and has lived there since for twenty years. She later met and married Sadao Kuujou, a Japanese jazz musician and Joutarou's father. She also goes by the name Seiko (聖子) in Japan as it is a direct translation of her English name.