Ginko Yurishiro

In the anime she was abandoned by her parents as a baby cub. She was always alone. After fighting in a war between humans and bears, she was supposed to die alone without finding love. A girl sang her a love song and saved Ginko. Ginko fell in love. Years after, Ginko meets Lulu Yurigasaki and Lulu joins her. They're on their way past the wall to reunite with the same girl. To do so, they had to transfer schools as "humans."