Leaf's departure is because of Wind's pursuit. Or because Tree didn't ask her to stay......

Tree
People call me "Tree".

I had dated 5 girls when I was in Pre-U. There is one girl who I love a lot but never dared to go after. She didn't have a pretty face, good figure or an outstanding charm. She was just a very ordinary girl. I liked her. I really liked her. I liked her innocence, her frankness, her intelligence and her fragility.