Relia Satan, formerly known as Makoto Fujimura, is the older half-sister of Shirou Fujimura, the current possessor of the Longinus, Divine Dividing, as well as the inheritor of the Will of Satan. She had raised Shirou since the incident ten years ago in which Shirou's mother, Miyako Fujimura, was killed, having altered his memories to believe he had known her since he was born.