Long ago, a far off planet known as Kumaria exploded, turning into a meteor shower that fell upon earth. This lead to the bears becoming violent and attacking the humans, who created the Wall of Severance between them and the bears. Several years later, two bears, Ginko Yurishiro and Lulu Yurigasaki, disguise themselves as humans and enroll in Arashigaoka Academy, where Ginko takes interest in a human girl named Kureha Tsubaki.