Kamado siblings are descendants of Kokushibo

 My theory is that the Tokito twins and the Kamado siblings are in fact both descendants of Kokushibo.

This theory came on a morning shortly after finishing the manga in the first two weeks of September 2026. It mainly started out as a simple thought. But then I thought about it, the more it started to make sense.

First there was the mangaka, which said that they, Tokito twins and the Kamado siblings, were related. Yet I could not think about how. After all, even though most assume that Tanjiro and Nezuko are the descendants of Yoriichi, but the manga clearly shows that his wife and child were killed, therefore a genetic dead end. So the only way that they could be the descendants of him is if he had a secret family, but no. That would not be something that he would do.

So, how is it that Tanjiro and Murichiro's father look similar? Well, that is where Kokushibo comes into the picture. He is the identical twin brother of Yoriichi who had a family (that was not named) which he abandoned to become a demon slayer before he became a demon and upper moon 1.

 Anyone that knows a thing or two about how identical twins are formed knows that the fertilised egg breaks in two forming two separate babies making them genetically almost 99% identical, as both inherit the same genes. Which leads to them having the same face, eyes and hair, with only small physical details that can differentiate between the two.

So you have someone that is identical to Yoriichi, that has almost identical genes, that has a living family that was unnamed that could pass on his genes to another generation. 

Now back to the unnamed family, now here’s a what if; what if that unnamed abandoned family was none other than the family that Yoriichi visited and gave his earnings to? What if the reason that he was even there was to meet his nephew and tell him all about what happened to his father? What if the reason he even gave that family his earnings was because they were family? 

After all, if you think about it, it makes sense as to why Yoriichi was there and why Tanjiro’s ancestor, that he was seeing through the eyes of, looked similar to Yoriichi. They were uncle and nephew! It would even explain why Tanjiro, with his hair long, looks almost identical to Yoriichi, why Mr Tokito, the father of the Tokito twins, looks almost identical to Tanjiro, they are both the descendants of Kokushibo back when he went by the name of Michikatsu Tsugikuni.

Stranger Things Why I Am Team I Believe

 From A Different Angle 

Well, most people who approach this topic come from a physical evidence based point of view, like the tattoo being missing and hints of the set designs. However I want to come from a different angle, Mike’s thought process from an emotional and fact based logic. Even though this is going to be a very short theory it is one that I want to make.

Right, time to cut to the point. Let’s look at Mike’s emotional based logic tells him that L is as dead as L in Death Note and Tim Kring’s Heroes. This is why it took him eighteen months (one and a half years) to mourn her. After all, it is quite clear that there was no change of Mike’s point of view as he is still moping around and missing her. He still is being clouded by emotions during all of this time, which is probably why he never was thinking about the destruction of the Upsidedown and the day that L ‘died’ as it would have gotten him all upset again. To put it simple, his emotions were clouding his mind.

The end of his emotions clouding his mind was the time before he went to graduation. Both him and Hopper were able to address the issue and he was allowed to truly get his emotions out. Once his emotions were flushed out he was able to get his mind clear.

Once he was free from his emotional thinking he was able to think clearly, so, once he saw the speakers that was when he was able to think more critically about the moment without his emotions getting in the way. Also, I am pretty certain that Mike would have seen many speakers in those eighteen months and not once did they cause him to think about that moment in a critical way. Yet now was the time when one of them caused him to think about it critically causing his mind to start ticking shows an internal shift. 

That internal shift was that he was no longer thinking emotionally but he was thinking logically. He was using nothing more than cold hard logic, logic that was no longer clouded by emotions. It was not his emotions telling him that reminded him that she could not see her powers in that moment as her Kryptonite was activated, it was his logic. It was not his emotions telling him that she got away, it was reason. 

After all, all he would need to do was just ask himself how? This would cause him to deduce the only way that the moment was even possible was if there was someone else, who could use her powers. Someone who could have pulled off the performance. This would have led him to deduce that it could have only been Eight. After all, who else was there that could have done it?

So he would have then asked himself how she was able to get out of there without being seen, this would have led him to deduce that she could not be seen, somehow. This would have led him to deduce this too.

So that is why I am in Team Believe. 

(Unless Conformity Gate is proven true one day and episode eight really was nothing more than Vecna’s Infinite Tsukuyomi…)