Shiro to Kuro no Ao

One day in the park, Sora encounters a mysterious talking rabbit called Ao.
Ao tells him he's searching for something important.
Sora ends up taking Ao home, but that night, a dark shadow appears and the two are dragged away to a "graveyard of stuffed animals."
Will Sora be able to return to the human world safely?

[Translated from official website]