I'm late to the aro positivity party but thought I could shout out a manga I read this year, I Want to be a Wall!
It's about an aroace woman (who is really into BL) and a gay man being arranged into a marriage and how they navigate that, growing closer and kind of becoming a QPR.
The stuff that really got to me was the discussion of the woman's experience with her asexuality (and aromanticism though that isn't explicitly labeled), how it connects to her media tastes and the way people have hurt her in the past. It was all absolutely heartbreaking.
A fun detail I also like is how the pair act out romantic tropes (Gift of Magi style misunderstanding, paranoia about "cheating,"), but they are all done through a platonic context.
(Ex. Even though they're not in romantic love, he still feels upset at the idea of losing their bond, or her getting hurt by someone he doesn't know.)
There's not too many chapters of it out, unfortunately (only like two volumes), but the ones I read are very enjoyable and I'd love to put this on other people's radar!
(btw, I got this manga rec from this video, and there's more in it!)
Asexual Manga and their Powerful Visibility
https://m.youtube.com/watch?v=urXrwYmMdgA