For many years ago I read a manga. I don't remember much, it's blurry. But is was something like this:
There was 3 gods and one of them took care of a beautiful flower. After some time the flower became a human. One of the gods took care of the girl and fall in love with her but she rejected him. Something happend and he died. Then the flower girl has to go to human world to serch for the gods heart so he can be revived again.