All of them have serious communication issues. And Aishira is kind of oblivious but I guess that's forgivable given her age.
I'm getting more and more annoyed by Tiara's constant shyness and blushing and ridiculously extreme humbleness. It makes her seem like a 10 year old, rather than an educated young woman of the aristocracy. And why was she bowing to her teacher? First of all, a lady should never bow, only curtsy. Secondly, a noble lady (especially the future Queen) should not lower themselves before a servant. Even if she was a Japanese person in her previous life (where those mannerisms most likely come from) she has spent 16~17 years living in that world with the appropriate etiquette drilled into her. There's just no way she would still behave so entirely like a Japanese person. Ugh.
Why set it in a European-inspired world when you end up disregarding EVERYTHING that would actually make it European-like? Is it just for the clothing? The crazy names? The 'exoticness'? Sorry if you read all that, I'm just a bit frustrated and needed to vent.
Nevertheless, thanks for the update!