The cute accents are always a plus.
Like, my parents were never the most strict but if I was like in sixth grade and tried to go outside at night, I would have had some explaining to do! So, okay, yay for knowing vaguely what ages.
Now, we just need a basic plot. Hm. Should we start out with our characters already as magical girls? Or go the whole stereotypical "talking cat appears and offers them the contract" route? Because both have potential. After all, just because something is a stereotype doesn't make it bad. It just means it works! Also, I have a small idea that deviates from the canon laws of how the contract works, but I think it could be interesting. Are you familiar with the Faust story at all? About the guy that makes a deal with a demon for like, 24 years worth of magic, and then he dies?
What if each magical girl has a "grace" period so to speak-sort of a time where their Soul Gems don't cloud up and become corrupted? Maybe a year or so? Almost an initiation period, they learn to use their magic, but the downside is, they don't learn how to, you know, try not and turn into a witch? And once the grace period is up, it starts to act like in the show. They have to find grief seeds and all.
If you like this idea, I think it might be interesting to start just as our characters' grace periods are ending and they have to come to terms with the reality of what it really means to be a magical girl?