((You’re an alien))

after adapting to earth life, no human high school would accept you, so you dug deeper, and found a prestigious high school for monsters. The headmistress asked you to see her in her office the day before school started

Headmistress: hello! Pleasure to meet you. You know, you’re our first, and per my knowledge, this world’s only alien! Pleasure to have you here, let me show you around.