Theory: Tatsuya & Miyuki are NOT siblings? (With spoilers)

[Karu]

Had this theory buzzing around in my head for ages & need to get it out to see whether is it feasible...
WARNING: Long post is longgg...


I dunno if anyone has come up with this before but i think that it is possible that Tatsuya & Miyuki are actually cousins rather than siblings...
The whole idea first came about when i read vol 8's "Untouchable — The Nightmare of 2062", where it was revealed that Yotsuba Maya was kidnapped and was

And my body has been messed with all over. Even the inside of my body has been disturbed. There is no place in my entire body that has not been fouled.

Thus it is down right possible that eggs had been harvested from her body during that time.
And even though Yotsuba Genzou wiped out the Kunlunfang Institute & Dahan in revenge for his daughter, there is no guarantee that he had managed to destroy every sample that had been taken from Maya. Furthermore, of the 7 Sages, one of them, Jiedo Heiga, is a survivor from Dahan which means either him or some other survivors could have taken the eggs/genetic material & gone underground more than a decade before they restarted/started their experiments. In fact, the reason why Tatsuya is a Born-Specialised Magician could be due to these experiments...

Okay, now that we got his "conception" cleared, how did Tatsuya end up with Shiba Miya?
I believe this is where the Kuroba, a Yostuba branch family that are responsible for the Yotsuba intelligence network, comes into play. They managed to come across information regarding the experiment and informed the current Yostuba head, Yostuba Maya. Either Maya, or someone picked by her, would have annihilated the lab & brought Tatsuya back to Japan. And Maya didn't want to raise a child that she doesn't regard as her own, so thus she sent Tatsuya to her married sister to be raised as Shiba Miya's "son" & Miyuki's Guardian. Plus, it was known that Maya was barren due to what was done to her during her kidnap and it will be hard to explain the sudden presence of a child in the Main Family.
This could happen at any point of Tatsuya's childhood but personally i believe it should be at some time shortly before he turned six where the experiments performed on him by his "mother" & aunt was supposedly to had taken place.

Now, it has been scientifically proven that a person learns both how to understand & express emotions in their childhood. But what if their childhood experiences had been erased & replaced with data-like memories? Won't the child be unable to process/express emotions properly? Just like Tatsuya? He does not have the ability to feel strong emotions, in fact he fakes most of them just to be able to fit into society.
The only true strong emotion that is left within Tatsuya is his love for Miyuki.
As for how Tatsuya's original memories were erased & replaced, that should have been done by Shiba Miya.
When she was 12 years old, she had been unable to erase her sister's memories of her traumas, she could only turn Maya's memory into knowledge. In guilt,

Miya broke her body from overusing her mind manipulation magic before she turned twenty like a penance.

During all those years, Miya could have finally found out how to use her magic to erase memories & thus able to use it on Tatsuya. However, implanting new memories is a different kettle of fish altogether, which should be why Miya could only implant data-like memories that are closer to knowledge rather than real memories that are experiences.

Last but not least, i noticed that for Japanese dramas/manga/anime etc... Whenever the authors want to make a bro-sis pairing work, the deus ex machina of "he/she is adopted! So everything is okay" would be used. Which is why i feel that it is possible that Tatsuya & Miyuki are actually NOT siblings...


So... What do you guys think?

[TriDent14]

Nice theory, but I dont think it's correct.
The thing about eggs and how he was created is nice but the way the Yotsuba somehow found him and decided to take him to the Yotsuba, and lie to every 1
is something I find very hard to believe.
And anyway, I hope that they are siblings and that the author won't pull out a fk twist and they will turn out to not be siblings.
This is not another romantic series where the main characters got to end up in a relationship, and I hope Tatsuya will remain single and will always guard Miyuki,
and I dont give a fk about Miyuki she can be with whoever she wants to(Masaki?) or remain single alone.
Tatsuya doesn't have feelings, and I hope the author won't ruin it by somehow "recovering" them.

But again, your theory is definitely possible

[Zuruumi]

Well I don´t know about them being siblings, but he will deffinitely recover his feelings, judging by current progress it is about 90 percent sure.
As for the theory, well it is certainly possible, but I think it is much more propable, that were it to be so, he were brought to Yotuba at his really early childhood (like till 1 year old) during their sweep of the labs.

[Karu]

Well I don´t know about them being siblings, but he will deffinitely recover his feelings, judging by current progress it is about 90 percent sure.
As for the theory, well it is certainly possible, but I think it is much more propable, that were it to be so, he were brought to Yotuba at his really early childhood (like till 1 year old) during their sweep of the labs.

I definitely hope that Tatsuya will be able to learn to feel emotions...
And i believe that he's slowly leaning to do so... Slowly cos he's a bit of emotion blockhead...


As for Tatsuya being brought back during Yotsuba Genzou's annihilation of Kunlunfang Institute & Dahan, the time frame won't match.
Genzou took down Dahan in half a year after Maya was kidnapped but Tatsuya was only born in 2079, 17 years afterwards... IF his birthday/age can be trusted.

[Psion]

It is unlikely he is the result of her egg, however it is possible that Maya has used genetic manipulation to place her own DNA in an egg - as to why she would that is a bit more difficult, lingering desire to be a mother seems unlikely (though perhaps, like Tatsuya's affection for his Miyuki, she has some emotions remaining) perhaps curiosity to see whether her genes would produce a superior magician? Unknown.

That said, while it is unlikely IMO that Tatsuya is Maya's child, it IS possible that in her brief confinement that material was taken from her - Tatsuya may well have a cousin... one with mental interference magic and supplying the nohead dragons with their lobotomised magicians.

[Karu]

It'll be interesting to find out whether a "cousin" is waiting in the wings to appear...
I wonder how their magic would clash...

But for the "lobotomised magicians", the Generators, they weren't created thru mental interference magic since they are(according to Vol 4, chapter 11)

He was a reconstructed individual — created through a combination of surgery and magically crafted medicinal herbs, hereby eradicating free will and emotions and completely controlling all thoughts and flushing all unnecessary thoughts that might obstruct magic activation.

Also, mental interference magic is Miya's forte, not Maya.
Also an interesting point to note in Vol 7, chapter 12...

Also, she was able to serve as Tatsuya's limiter precisely because she possessed mental interference magic.

Miyuki inherited their mother's magic but Tatsuya didn't...

[Psion]

It is quite possible to inherit features that an uncle or aunt has also inherited more strongly than you inherit the features of a parent; given we are told that the Yotsuba are rather well known for this, I still consider it a possibility - though I do admit there are many more.

Also, while I have read that about the generators... it would not surprise me if it were a cover; at least I am hoping so lol

[japzone]

It is completely possible not to look anything like your blood parents. I have two siblings that bare almost no resemblance to our parents. Both parents are Brown Haired/Brown Eyed, while my siblings are both Blond Hair/Blue Eyes. Physical features can easily skip generations, or only show up if both parents have a recessive gene. Not to mention the fact of genetic mutation. African Parents can even give birth to a Blond Hair/White Skinned baby. If you don't believe me you can just google it.

[nr42]

The main problem remains the timeline. We've had this discussion before in the "incest ending"-topic on this forum. The only options are that either the "unable to bare children" meant that her eggs were ok, but she physically isn't able to anymore; or, the eggs were retaken by the Yotsuba. But in both cases the Yotsuba consciously decided.
Also, we know that Tatsuya thinks Miyuki is his sister and wouldn't it be likely for him to have done a dna-test? He has the same knowledge we have about this, is cold and calculating, and it would be a necessary knowledge in his struggle against the Yotsuba. Also the excessive Pion count and being bad at magic are consistent with his father and I don't know if he would be their pick for Maya's offspring if he was already Miya's husband. (gene diversity and such)

[Psion]

"As I was saying... Onii-sama and I are true siblings. Or at least that's what it says on the records, and DNA tests have always confirmed that relation."

Note the use of plural language refers to tests that have been completed multiple times; quite possibly because they doubted the results. It is entirely possible that either the Yotsuba, Tatsuya or even Miyuki might have interfered with the tests.

The Yotsuba's reasons for doing so are quite easy to understand; for the siblings however there are also potential reasons. One such is that they are highly doubtful of their biological relationship, yet do not want to face the possibility that the one remaining emotion to Tatsuya (affection towards Miyuki as his sister) is then terminated. After all, it is one of the few things that are said make him recall that he is human, this is something that he seems to identify as being valuable or desirable. Likewise I think it highly likely that Miyuki would like his affection towards her to remain both because she wants him to like her and because she perceives that it is 'good' for him that he likes her.

Tatsuya almost certainly has the connections to make such alterations himself, independently of the Yotsuba, while Miyuki would likely need to rely on the power of the Yotsuba to be able to do so without her brother knowing.

[Azyrion]

"As I was saying... Onii-sama and I are true siblings. Or at least that's what it says on the records, and DNA tests have always confirmed that relation."

Note the use of plural language refers to tests that have been completed multiple times; quite possibly because they doubted the results. It is entirely possible that either the Yotsuba, Tatsuya or even Miyuki might have interfered with the tests.

The Yotsuba's reasons for doing so are quite easy to understand; for the siblings however there are also potential reasons. One such is that they are highly doubtful of their biological relationship, yet do not want to face the possibility that the one remaining emotion to Tatsuya (affection towards Miyuki as his sister) is then terminated. After all, it is one of the few things that are said make him recall that he is human, this is something that he seems to identify as being valuable or desirable. Likewise I think it highly likely that Miyuki would like his affection towards her to remain both because she wants him to like her and because she perceives that it is 'good' for him that he likes her.

Tatsuya almost certainly has the connections to make such alterations himself, independently of the Yotsuba, while Miyuki would likely need to rely on the power of the Yotsuba to be able to do so without her brother knowing.

You forget something elementary: What you say would be plausible only if Tatsuya had such connection/influence since childhood. The tests would have been conducted early on as the suspicious difference between the siblings was known since early childhood. The would have not waited till their teenage years to make such important tests. They only ones who would have enough influence to alter the results for whatever reasons at that time would be Miya and Maya .

[Psion]

It is actually more a matter of identifying the motivation for the test in the first place. Who would seek to run the tests in the first place? Someone who would like to clarify the relationship between Tatsuya and Miyuki - or who were not comfortable with the established perception of brother/sister. It would be far more likely to be Miyuki or Tatsuya looking for clarification, some party attempting to specify he relationship between the two or some systematic approach.

From a legal perspective it would need to be someone with sufficient permission must have initiated the test in the first place (that is if the tests are real). It would need to be someone with sufficient rights to obtain their medical information, generally this is either going to be the parent/legal guardians or else the government or magical authorities... In just about any legal jurisdiction, a minor does not have the ability to request a service of this nature for themselves or for another minor (minors are only allowed to enter into certain types of contract, most notably for 'necessities' i.e. they can enter into a contract for the exchange of a loaf of bread, but they cannot enter into a contract to sell one of their kidneys). So it would seem Tatsuya/Miyuki would be ruled out along with any party other than the Yotsuba Family, the Shiba Family or the Government... but that is assuming it is done legally.

• The Yotsuba would have been fine with things as they were; they have no need to attempt to determine if Tatsua and Miyuki are brother and sister, because if the two were not really blood related that would, if anything, diminish their control over Tatsuya; it simply is of no benefit for them to cast doubt on this relationship. It is however possible that they might seek to specify the nature of the relationship, as opposed to clarify it - therefore if there were a DNA test run it is entirely plausible they might seek to interfere with it to ensure that the relationship between the two is specified as brother and sister.
  
  Could it have been the Shiba family? There seems extremely little in it for them to tell Miyuki that the two are siblings; if anything, were the Shiba family to act independently of the Yotsuba family it would be that they would seek to distance the siblings from the Yotsuba, in particular Tatsuya. After all they might have been attempting to secure Tatsuya against Yotsuba control to enhance their own control over him (or perhaps their father puts on a much better façade than we realised - and he is really a softy).
  
  Could another family have done so? Yes, but why? Until recently it seems few had ever heard of Tatsuya or Miyuki so this seems unlikely.
  
  In terms of the government, there may be standardised genetic tests done on all identified magicians. We have heard nothing about standardised genetic testing at this point - and the extent to which the hundred families (and particularly the 28 families) would protest this seems to suggest that this systematic approach to genetic identification would face immense opposition; not to mention potentially becoming a major threat to national security by providing a database of the nations magical genetics - which are a huge national asset and source of military advantage, which would have cost a large amount of 'human' lives, time and money to obtain... Certainly not the sort of thing to needlessly publish - potentially such a database might be a resource they might form.
  
  As for Tatsuya/Miyuki, this is a little more interesting. Miyuki herself seems to lack the ability to do so, however Tatsuya is another matter. In addition to the people he knows in intelligence, he also has access to large amounts of money and cutting edge technology, in terms of capacity to run a DNA test, it is extremely likely that he currently has the ability to do so. However he is a relatively newly established player - and we have no idea when the tests were supposedly run

The Government origin is plausible (in comparison to Yotsuba or Shiba families) however it simply seems seems less likely than Tatsuya managing to secure DNA testing; given his current access to personnel and technological assets, it seems entirely possible that he was able to arrange DNA testing (especially since we do not know when this testing is alleged to have occurred).

In either case however, Miyuki would still need to obtain access to the results; she would almost certainly need to rely on the abilities of the Yotsuba family or on her brother (as the only two major sources of information that she has); she is more likely to have trusted her brother to tell her the truth than the Yotsuba, but at the same time it is also possible she would want to keep the information secret from her brother.

So the question then becomes would either the Yotsuba or Tatsuya provide her with incorrect information about her relationship with Tatsuya? In my opinion both might have their reasons for doing so - strangely enough, IMO Tatsuya would be far more likely to lie to Miyuki about this than the Yotsuba actually; and this is all assuming that Miyuki was telling the truth that she had previously had access to such results.

[ergoGnomik]

I think you are covercomplicating things unnecessarily with these conteo like ideas.

Firstly, think about the time, please. The nightmare of 2062 certainly happened in 2062. Taking clues from what is written in Volume 8, it may be assumed that the Yotsuba completely destroyed Dahan at the latest by the end of 2063. Then not much later the Great Asian Alliance annexed Dahan. Tatsuya is 16 in 2095, 13 during the Okinawa incident. The kidnapping of Maya happened 30 years before that, which was immediately followed by the complete destruction of the Dahan government and magic community and then an invasion from GAA. How likely do you think that during the chaos and the following oppression someone succesfully managed to found and then keep up a secret magician production and raising project?

Secondly, why would the Yotsuba enter someone with unknown lineage and broken magic talent into the main branch of the family? No matter how he should have been created from whose genetic material, not being born naturally into Yotsuba or born from their experiments means questionable background. They may take someone like this as a guinea pig but not as a family member even if the member in question is treated as a mere attendant.

[Karu]

Firstly, think about the time, please. The nightmare of 2062 certainly happened in 2062. Taking clues from what is written in Volume 8, it may be assumed that the Yotsuba completely destroyed Dahan at the latest by the end of 2063. Then not much later the Great Asian Alliance annexed Dahan. Tatsuya is 16 in 2095, 13 during the Okinawa incident. The kidnapping of Maya happened 30 years before that, which was immediately followed by the complete destruction of the Dahan government and magic community and then an invasion from GAA. How likely do you think that during the chaos and the following oppression someone succesfully managed to found and then keep up a secret magician production and raising project?

But Tatsuya was born around 17 years after the annexation of Dahan. That's more than enough time to set up/restart the experiment.
And it might not even have happened in Dahan. During the chaos of the annexation, Maya's genetic materials could even had been smuggled out of the country.
And if Jiedo Heiga was involved in the experiment, which is highly likely, he could even have smuggled everything to Hong Kong where the HQ of the organisation he founded, No Head Dragon, was based.

[Psion]

I think you are covercomplicating things unnecessarily with these conteo like ideas.

Firstly, think about the time, please. The nightmare of 2062 certainly happened in 2062. Taking clues from what is written in Volume 8, it may be assumed that the Yotsuba completely destroyed Dahan at the latest by the end of 2063. Then not much later the Great Asian Alliance annexed Dahan. Tatsuya is 16 in 2095, 13 during the Okinawa incident. The kidnapping of Maya happened 30 years before that, which was immediately followed by the complete destruction of the Dahan government and magic community and then an invasion from GAA. How likely do you think that during the chaos and the following oppression someone succesfully managed to found and then keep up a secret magician production and raising project?

Secondly, why would the Yotsuba enter someone with unknown lineage and broken magic talent into the main branch of the family? No matter how he should have been created from whose genetic material, not being born naturally into Yotsuba or born from their experiments means questionable background. They may take someone like this as a guinea pig but not as a family member even if the member in question is treated as a mere attendant.

Oh personally I think it is likely that they are siblings, cousins at the most; I was merely commenting on the genetic testing component of the thread.