This is really hard to read; it's honestly not very good.
The premise is great, I kinda low key love the art, but the MC is just so unbelievably weird; like, think about it:
A girl grows up with a boy for most of her life, he constantly is in her life, he makes it plain he loves her... and she's CONFUSED?!
Any girl who has known you for more than a year knows your favorite colour, even if (or especially if) she doesnt like you; she knows your birthday, and she knows how your family is doing.
If she's known you for 12 years? She knows damn well what kind of person you are, because girls ask. It's a genetic imperative for girls to be socially aware, even if they have magic obsession (which they absolutely would).
It just doesn't read well to have a 17(/32?)-year-old woman acting like a 12-year-old boy; it's just... weird as shit.
And poor writing.