After falling out of a 4th story window, Hashiba Sora has lost his memory. He returns to his school to find a new roommate in his dormitory. Sora gradually begins to fall in love with his new male roommate, while trying to put together pieces of his past.
http://www.animenewsnetwork.com/encyclopedia/anime.php?id=4633Note-there's boy/boy love.
xp But it's still good to watch.