The foreshadowing of Left and Right being Yuru and Asa's respective antithesis has been there since chapter 1:
If you look closely, Asa is standing next to the two horned statue, i.e. Right, with her palm open, while Yuru stands next to Left (perhaps his hand being out of frame is supposed to represent him not having gotten his powers yet). Along with this, Asa also lost her right eye and uses her right hand for wielding the power of Kai. Yuru will presumably also lose his left eye and use his left hand to wield Fuu (like he did when tricking Tenaga Ashinaga).
So I went and reread all YnT available chapters a couple of days ago (36 of them) and I thought I'd write about a plot point that is making me have many questions, in case someone had any theories.
[Spoilers ahead]
Whatever is going on with Granny Yamaha and the twins 400 years ago? This has me: so confused.
It is not clear yet who was the master of Sayuu-sama 400 years ago. Not is it clear to me how the contract with that person got broken.
There are four options:
The master got killed
They got broken
They got sealed
They resolved the contract peacefully
Now the first two would mean Sayuu-sama were an stray. That only seems to mean that they get bound to their location, which we can't prove they weren't, because they didn't move. In contrast, Mountain God moved when in relic form. But this doesn't explain why Dera's necklace is a thing.
If they were sealed, that would explain the need of an extra step to make a contract with them. The extra step is Dera's necklace. How does it work? It is not part of Sayuu's relic, because it remains even after contracting with them, but it has to be part of them, because Yuru's blood went on it to make the contract. So maybe that what seal does? It makes it so a key is needed to contract with the tsugai?
But this doesn't explain how Ken freed Tenagaashinaga then if a key was needed after they were sealed (because they were sealed presummably by the seal twin 1200 years ago)??? Or just do the Tadera have all the keys for all the tsugai????
If they resolved the contract peacefully, they said they would fly back to the village. And this again doesn't explain Dera's necklace. And it would have been after the twin that didn't die died, theoretically, becaus Sayuu-sama is used to keep Seal and Break in check. And I'm still not convinced they died.
Because the ward of Higashimura made by Granny Yamaha looks an awful lot like seal!! And "she's so old she doesnt even remember her age". It would make sense for her to be the seal twin, and the break twin would be the one that died ages ago without reviving. I take it she could "seal" herself alive. But. But. Then this doesn't explain why her eyes are normal.
And even if she isn't. She does the ward. She has to have some tsugai. What are they?!?!??
