The Ribika are a feline race characterized by their ears and tails. They possess lithe, agile bodies and inhabit the land of Shisa. Yet, a curse known as the "Void" is spreading through the forests... Konoe, a Ribika, resides in the small village of Karou. One morning, he awakens to discover that his ears and tail have turned black. A symbol also appears on his body: the mark of the curse. Konoe sets out on a journey through the forest to uncover the truth.