I don't know if this answers the question: What's So Cool About Magical Girls? but I hope that it might enable an answer.
This is a simple 2d6 plus modifiers with a consistent target number of 8+. Built on the chassis of What's So Cool About Outer Space? which is, itself, based on Tunnel Goons, Sword & Backpack and that really old classic sci-fi rpg about Beowulf.
Within you will find the rules needed to play, tables to help if you're stuck, some optional rules, and a bibliography and ludography.