I Was Spotted By Grindelwald and Went To Hogwarts

Principal: Gellert Grindelwald
(President of the Wizarding Reform Association, first-class magician of the Merlin Order)
To Mr. Sean Wallup.
Congratulations, you have been accepted to study at Nurmengard School of Witchcraft and Wizardry. Enclosed is a list of required books and equipment.
The semester is scheduled to start on September 1st, please return your responses by July 31st.
Vice Principal (Female)
Vita Rozier
sincerely
Looking at the second magic school admission letter he received, Sean fell into deep thought…
There is a big problem in this magical world…