 If you liked
Vampire Knight
|
 ...then you might like
Snow Love
|
In both there is an immortal being [in VK a Vampire/in SL a demon] that has known a girl since she was born [Yuuki/Xue] and a human guy that is a Vampire/Demon hunter very close to the girl. Similar Love triangle and characters: heroine is naive and optimistic, immortal guy is very handsome and powerful and had dark brown hair while the hunter guy is blonde and is obsessed with revenge.