From The Animeraider:

Amano Julie is a young free spirited high-school girl who has been watching her parent's marriage fall apart bit by bit, even though they were high school sweethearts themselves. She wants nothing to do with love and would rather die than turn into the people her parents have become. Then late one day after going to Karaoke with a friend her parents have forbidden her to see she runs into Ouji Amano, a handsome classmate who looks like he's just been in a fight. He asks her to date him on the spot, which bewilders her.