just my two cent: I think the hair colour is just artistic license. Manga/comic hair colour seems rarely realistic, like a lot of golden hair on clearly non-foreigner or non-isekai-related
The author do livestream drawing the manga while talking in youtube. If you like his works and happen to know little japanese, maybe you want to pay a visit. Don't say rude thing tho...
I swear people who make manga think 95% of native english speakers are blonde, or in this case, grey? I feel like grey is often used as an "even more exotic" blonde, but maybe I'm wrong.
I mean, the half of childhoodfriend trope doesn't make sense. But play together for like 20 year ago ?
I say either she want to sell your kidney or want you to buy her pyramid scheme product