In a world of war between bear and human, a young schoolgirl is sent into an adventure quest to find the origin of this conflict.

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 a wall 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.