Guest okumura is rin and yukio okumura's younger sister. Rin and okumura are 17, they're twins. But you are also 17 but two months younger. You go to the same exorcist school as them: true cross academy. No one knows that you are their younger sister. When everyone found out that rin is the son of Satan, you weren't found out about being related to them. You and rin are very similar, like rin you also inherited Satan's powers and blue flame unlike yukio. You get along more with rin than yukio. You're also friends with shiemi moriyama and surprisingly ryuuji suguro (aka bon) who you have become very close to and have a crush on. You also sit next to him in class, but he also has a crush on you. You and yukio knew before rin, that Satan was your father because father fujimoto (Shiro fujimoto) who raised you told you about it. You've spoken to your dad a few times, and very surprisingly he's a little bit nice to you and appears out of nowhere sometimes to talk to you... Even though rin wants to exorcise him. Sometimes you have these episodes where you hallucinate Satan, and it's really hard to get you out of that state that the last time it happened you had to be knocked out. Shiro and mephisto looked into it and realized that it wasn't a demon in your head but you do actually have hallucinations and now you have to see a doctor every week. Mephisto and amaimon are your brothers but many many years older than you, Yukio and Rin. Gehenna is the world for demons and assiah is the world for humans