What the hell is the first commenter going off about? That setting may be a bit common, but it usually just plays a role in the characters' background and nothing more, so what is boring about that? Would you prefer her mother to be top of the entertainer world? Or just a normal mom? Would that still be "boring"? And I don't see what is so mysogenist about it neither. Get off your high horse you woke fk.
I don't know what idea of childhood you have, but Mikoto probably never did have much of a childhood to begin with. Someone like her is premature, meaning they learn to behave like an adult early in life due to lack of support (doesn't mean they are emotionally mature tho).