Even though I’ve never actually seen it around, I’m sure this theory is nothing new in the Ao no Exorcist fandom. Still, I just recently re-read the manga and felt like I had to write this down.





The Mother: YURI EGIN

1. “You… are the son of a demon born of a human impregnated by a demon… and not just any demon. You are the son of Satan.” - Shirō Fujimoto, Chapter 1. 2. “You know, I’m a perfect entity with infinite power. But there’s one thing, just one little thing, that I don’t have. You know what that is? A substance in this world of Assiah powerful enough to contain me!!! Anything I touch in this world is doomed to destruction…! Just like this body [Shirō]… and just like your mother…! It’s Assiah that I want…! Oh, it was out of mere boredom that I created you… but I have since realized, it was a masterstroke! You exist in the world of Assiah and yet you bear the blood of the god of Gehenna…!! You are exactly what I need to make Assiah mine!!” - Satan, Chapter 1. 3. “…In other words, 15 years ago… when Fujimoto Shirō claimed to have exorcised the child of Satan with Koumaken, who Lower Second Class Exorcist Yuri Egin was pregnant with, are you saying that report itself was false?” - Grigori, Chapter 14. 4. “Okumura-kun… No, ‘Rin Okumura’ is… the child born of a human woman that Satan’s possessed body impregnated around 15 years ago.” - Yukio Okumura, Chapter 15.

In the manga, these four little quotes are the only references to the mother of Rin and Yukio Okumura. There is a filler arc in the anime that tells us a much more detailed story, but, for this theory, I am going to completely put that story aside, and work solely with the information we have from the manga:

Yuri Egin was a Lower Second Class Exorcist (quote 3), who was impregnated by Satan’s vessel (quote 4), gave birth 15 years ago to Rin and Yukio Okumura (quotes 3 and 4) and died due to being “touched” by Satan (quote 2).

Yes, the manga doesn’t give us much…

…We aren’t told her age. >> Though it seems clear, in view of her exorcist rank, that Yuri was quite young when she got pregnant. Considering that the exams for exorcist’s rank progression happen every year, looking at this diagram,



if she, like Rin, Shiemi and all the others, was an Exwire at 15, then, most likely, she became an Exorcist at 16 and a Lower Second Class Exorcist at 17. Therefore, she couldn’t yet be 18 years old at the time. This, of course, assuming that Yuri didn’t fail any of her exams. …We aren’t told a thing about her family and provenance. >> Nothing about her appearance either (we might’ve been shown her face in the manga already, though). Or even about the exorcist meister(s) she held… nothing. …We aren’t told when she died. >> We do know that Yuri’s body eventually succumbed due to coming into contact with Satan’s power (quote 2). But we are never told when precisely that was. Did she die right after giving birth? Or did she get to spend some time with her children before she died? We don’t know. We only know that the contact she had with Satan’s power doesn’t seem to have been very direct and/or intense, seeing that she survived it for 9 months or longer. …We aren’t told anything about the man (“Satan’s possessed body” quote 4) who impregnated Yuri. >> Who was this person? Was he Yuri’s meaningful someone or was he just a random guy who raped her under Satan’s control? Somehow, it feels like Satan actually regrets Yuri’s death (quote 2), so I think it wasn’t rape. My bet would be that Satan possessed someone Yuri loved. Yet, seeing what happened to Shirō in Chapter 1, and how incredibly fast it happened, it seems really far-fetched to pose the possibility of that mystery-man’s survival.

Unless The Blue Night happened so that said man wouldn’t be immediately disintegrated by Satan’s flames before he could actually… you know… impregnate Yuri.

Now… what if the protection of The Blue Night didn’t only allow that mystery-man to successfully impregnate Yuri, but also allowed him to survive the whole thing…? This leads me to my next theory. Keep reading.





The Father: SHIRō FUJIMOTO

Did you notice how, in quote 2, the only two humans Satan actually refers to are Shirō and Yuri?

We know that there was a man Satan possessed so that he could impregnate Yuri (quote 4). We know that he possessed that man for just long enough to conceive a pregnancy. I would say a reference to that man, even if a disgusted “Just like this body [Shirō]… just like your mother… and just like the low-life piece of shit man I wore to impregnate her…!”, or something like that, would’ve been expected, no? Did Satan just forget the guy? Or did he… actually… already referred to him in the beginning of that sentence?

Not enough to convince you? Keep reading.

5. “Father… was the only man in the world thought to be able to sustain possession by Satan himself… and so, naturally, Satan was constantly after his body! For fifteen years, he fought that off through pure force of will!” - Yukio Okumura, Chapter 2.

Reading this quote, I can’t help but wonder why was it that people (or, at least, some people Yukio had come into contact with) believed that Shirō would be able to sustain Satan’s possession. And why only for the last 15 years? What was it that happened 15 years ago? I tell you! The twins’ birth.

The first time I read the manga, I told myself that this (quote 5) was because, during all those years, Satan had been trying to get to his sons. And it probably was that.

But, here’s the thing, people didn’t know that Satan was trying to get to his spawn because people didn’t know that the twins were alive and well, being brought up by Shirō. That was a very well-kept secret that only Shirō and Mephisto knew about. Everyone else believed Shirō had eliminated exorcised them the day they were born (quote 3).

So, unless there was something else that happened 15-16 years ago that would lead more people to believe such a thing (quote 5), there was literally no way that would be the knowledge of people other than Shirō and Mephisto themselves.

Now, what was it that happened 15-16 years ago, other than the birth of the twins, that would lead at least some people to believe that Shirō was able to sustain Satan’s possession? I tell you! The twins’ conception.

And this is the moment when most of you will stop reading this. I won’t blame you, because, before this manga re-read, I would do that too. It sounds just too far-fetched, doesn’t it? Even if what I am suggesting had happened, then, from what we saw that happened to Shirō in Chapter 1, Shirō would, most definitely, not have survived it.

As I’ve mentioned before, I think the sole purpose of The Blue Night, that happened about 16 years ago, was to buy Satan’s vessel enough time to complete his mission of impregnating Yuri. My belief is that The Blue Night was so effective that, even though probably nearly dead, Shirō actually survived Satan’s possession. And, for the (probably) few people that knew about this event, this was perhaps what led them to believe that Shirō might be a compatible vessel for Satan.

The first time I read the manga, though, I didn’t see The Blue Night as a possible explanation, because the characters kept saying it had happened 16 years ago, not “15 years and 9 months ago”. Hehe. But, on re-reading the Impure King arc, things became quite clear to me.

In the letter that Tatsuma Suguro wrote to Rin, he recalls the events of “a little before your birth”. In that flashback, most of the people of the temple were sick, trying to recover from the events of The Blue Night, Bon’s pregnant mother included. And that’s when 34-year-old “badly injured” Shirō Fujimoto arrives and asks for the Koumaken so he could “kill some kiddies” (the twins) with it. Also, I just want you guys to take a long careful look at Shirō’s expression while he watches Tatsuma hug his now healthy pregnant wife.





What do you see?

Okay, but back to the point, considering that Bon as still an unborn baby and that Mephisto sealed Rin’s demonic heart into Kurikara the day the twins were born, it’s quite clear that this was before their birth. Bon was born on August the 20th and the twins on December the 27th. Looking at Torako’s belly in Tatsuma’s flashback, I would say it wouldn’t take much longer for Bon to be born, while it would still take the twins some months to be born. This is because Torako was already pregnant before The Blue Night, while Yuri only because pregnant after it.

Lastly but not least, there is some circumstantial evidence I want to remind you of. Though I call it “circumstantial”, from my personal experience, in manga, this kind of evidence often ends up being relevant and that is why I want to refer to it here as well.

Both Rin and Yukio bear quite a lot of resemblance to Shirō!

I mean, the events with Kuro are quite self-explanatory. Rin’s behaviour is so shockingly similar to Shirō’s, it’s not even funny. Rin reminds Shura of Shirō. Tatsuma also thinks Rin is a lot like Shirō.

And then there’s Yukio, who is brilliant like Shirō was (actually, more brilliant) and also a Doctor and a Dragoon, just like Shirō. In that scene I just linked you to, Tōdō is trying to hurt Yukio by saying that the boy had intentionally tried to become a carbon copy of his father. Yukio doesn’t fight that notion, because truth is he had always idolized his father (and brother) and had always tried to become strong like him (them).

But, here’s the thing, Yukio wanted to become a doctor (well, another kind of doctor, but still) before he even knew about exorcists. And, his talent as a perfect shot Dragoon has been mentioned so often in the manga that I won’t even try to link you to all the references. Hehe.

Point is, both Rin and Yukio ended up resembling their human father (biologic or not), Shirō, a lot. And, even though it may mean nothing, it may also be “circumstantial evidence” to support the theory I described above.





[If you enjoyed this theory you may also want to take a look at Shirō Fujimoto’s death: a tragedy or a means to an end? and Is Lewin Light Lucifer’s illegitimate son? AND Does Satan need Yukio’s consent?]

