Mahou Shoujo Santa Claus

University student by day, champion of justice by night… Santa Claus is coming to town!

Every December, university student Noelle gains the power to transform into Santa Claus. Her mission is to bring joy to the hearts of children all around the world by protecting the Workshop in the North Pole and delivering gifts to every child on the Nice list by Christmas. There’s only one problem: she’s stuck doing a supplementary winter course with her best friend Rudy to improve her grades... while trying to stop her mortal enemy Nez from sabotaging Christmas!

[From itch.io]