The Reason
"A long time ago, there was a boy and a girl. The girl was powerful and strong, but shunned because of her strength, the boy brave and determined, but rejected because of his lineage. They met with the notion of destroying each other, but found they could not."
Young Kagome clasped her tiny fist together and sighed wistfully. "So tragic, so romantic."
Mrs. Higurashi smiled. "Very. But it wasn't this girl who opened the boy's heart, but one who was stronger." She leaned forward and tucked her daughter's hair behind her ear.
"Why?"
"Because the other girl loved him selflessly."