A strange major to be sure. Those who major in the area of magical girl studies will learn about transformations and the magic power of various... outfits.
As there are various kinds of magical girls, this is somewhat of an interdisciplinary field. There is definitely some crossover here with Witchcraft and Wizardry.
A first year student will be expected to learn about the fundamentals of transformation sequences. Of course, they will be learning the history of magical girls, along with their tools. In this class, they will make their own, personalized magical tool.
Some students may want to learn flight, summon familiars, fire lasers, etc.