In a word, this is a secret love story.
Secret love, secret love, secret love, say the important things three times.
A girl has a crush on a boy, yes, that's the usual route, the male protagonist is a heartthrob - it's really good when he has good grades, good looks, good popularity, and good relationships with everyone. He has everything he should have, and he also has everything he shouldn't have, ahem, such as his face.
Oh, the heroine has always been a mystery.