I've Fallen, Haven't I?

Gay love story eventually, just so you're warned.

Kou is an abnormally smart and handsome person, but has a really bad personality and nobody really like him. He's also gay, but his parents understand. Kou has a really weird dream with a really beautiful person in it, but he doesn't know who it is. The next day, Kou's class has a transfer student, Casting. It's the same person from his dream. What's going to happen to these two?