Magical Pet: My Highness Isn't Human

Everyone says school life is full of fun, so why is her prince such a weirdo? He takes an umbrella everywhere and even likes to drink salt water! She has her doting student council president brother to protect her, yet she can't resist the strange prince's romantic advances. She's the top student everyone admires, but even she can't withstand the mysterious transfer student's aloof elegance. Everything wonderful and happy in her life is wiped away from the day she meets him! What? My prince isn't human?