Demon Slayer: Kimetsu no Yaiba

[DarthEnderX]

then there is Tanjiro's birthmark, which gets bigger when he does this Sun(? can't remember)-breathing of his.

Isn't that mark a tattoo that he got over his original scar?

So obviously, there are connections established already and the memory didn't give us any more to work on imho.

Not for us. But it's giving Tanjiro information he wouldn't otherwise have.

I mean, why not just put the info in the book he's reading?