Yuri Frederick Egin

Yuri Egin was the lover of Satan, mother of Rin and Yukio Okumura, and a close friend of Shiro Fujimoto. A Junior Second Class Exorcist specializing as a Tamer, she refused combat roles, choosing instead to care for demons at the True Cross Order's Demon Farm.

Raised on the streets after her adoptive parents died in a fire, Yuri grew up with an early, informal understanding of spirits, having befriended a small wandering spirit she called Rinka in her childhood — the very spirit who would later become Satan. When Satan possessed a clone created in Section 13, Yuri became his caretaker, holding onto faith in his redemption even as his cruelty grew.

Her relationship with Satan produced twin sons, and her attempt to flee with them ended in the True Cross Order's intervention and her death shortly after childbirth. Open-hearted and empathetic even toward demons, Yuri's kindness left a lasting mark on Shiro, softening a man who had initially rejected her affection.