Mahou Showdown specializes in Dark Magical Girl TTRPGs.
With games heavily influenced by Madoka Magica, Mahou Showdown started with the post-apocalypse Magical Girl game It'd Take a Miracle in 2022, creating it between March 16th and April 30th in the leadup to Walpurgisnacht.
Since then, this has turned into a yearly Game Jam: Countdown to Walpurgisnacht, in which fellow creators make magical-girl themes projects between March 16th and April 30th.
You can view each year's submission and project here!