Females are groomed and brainwashed before their births that our best and most important asset and value is our body/appearance, because of the patriarchy, and females being complicit in their own oppression isn't new, it's sad and cruel, and she is a fictional character where the author disgustingly objectifies her.
If you're an adult who thinks women and especially girls sexualizing themselves is okay and normal, get professional mental help, because this is not normal.

Japanese mangakas know how to ruin their works/leave a sour taste on people's mouths by sexualizing teenagers ( ̄へ ̄)
Cute story, but the female lead is sexualized and objectified.