My brain has created a robust simulation of Urobuchi Gen.

[snarp]

I dreamed about his new show that's basically just the dude being upset that women liked Madoka. A bunch of magical girls are at a magical girl boarding school, and each episode is about their vicious in-fighting, usually culminating in at least one death. Which is the purpose of the school - there can be only three magical girls at a time.

It takes a few episodes for the deaths to start. We're initially introduced to three specific girls as the protagonists, with one in particular, who's Robin Hood-themed and has invisibility powers, being set up as the heroine. A couple episodes in, Robin is thrown into conflict with one of the other two, panics, and kills her.

When she calms down, she immediately starts rationalizing what she did to herself and the two or three other kids who talk to her. Then, to drive home the point that this is not the first time Robin has killed another child, she finishes up the episode by killing three other girls.

There's a flashback episode about a girl with some sort of healing power, who we haven't seen at the school yet - we assume she's about to be recruited and will be the transfer student who becomes the new protagonist. She's trans and living with another trans girl, and it's pretty cute right until the other girl is horribly murdered. Then we move forward forty years and find out that healing-girl is the evil dean.