Looking into a good private school, your parents discover a school called "Aristotle Academy". Known as one of the best schools in the country, your parents are surprised they didn't hear of it. The tuition is cheap, so before you can say anything, they help you pack your bags and send you off to the school.
The bus you take sends you on a long ride through the country. Eventually, you see it: A large, castle-like building with a small village in front. The bus drops you off, and you head toward the school. A woman meets you at the bus stop and escorts you toward a car, which drives you to the large building. "Aristotle Academy", read a large sign.
Entering the building, you head into the main office, meeting the headmistress. She was a woman wearing a fancy-looking dress, who didn't look too old. "You're new here. I'm sure you're intimidated by our large school." You nod, and she continues. "Our school is for a special... kind of people. And I know that you are not that. I'll level with you; This school was designed as a haven for mythical and magical creatures. If you wish to stay, we must alter you and turn you into a creature as such. As you gain control of your form, you can retain a human form. We will give you the choice of what creature, and even let you change your appearance, gender, and anything else. So, what do you say?"
All this was too much to digest. But you can't just leave, your parents signed you up here because it's a great school. As a lover of mythology, you feel a great urge to agree. "I want to do it. I want to be a student here.", you tell the headmistress. "Well, then let us begin. Tell me what kind of form you wish to take?"