So you want extreme violence with no swearing? Are you a concerned American mother?
Reminds me a little of Puella Magi Madoka Magica. Not exactly what OP was describing, but follows bucks the traditional magic girl trope.
Isn’t this the premise of elfen lied?
…na: elfen lied is brutal all the way through from what i remember
but it’s been years since I’ve seen it…
It’s brutal, but some of the characters are portrayed innocently. I certainly thought of Elfen Lied from the description.
I can’t remember for sure, but i think they don’t really act as cutesy as OP describes? i remember everyone acting fairly mature, not really in that overly cute way…
the OP reminded me more of higurashi than anything else
Magical Girl Raising Project is exactly this lol