I apologise if it's crappy or there are grammatical errors. K bye

A young man and his older sister begin their time a the most prestigious schools in all the world. Only one problem, the students are absolutely nuts! (Y/N) is the new TA for class 77-B, his sister's the teacher and it's his first school he's been to. The question is why? But now, he has two choices on what his future will hold. Will he use his power to protect others? Or use them to cause destruction?