This story takes place during an age of winter.
After losing a war against the vampires, humanity has lost most of its living space on Earth. From their last small city, which is surrounded by a barrier of light, they seek to once again expand their territory.
Among the oppressed humans lives a girl named Momo, who wants to coexist with the vampires. One day, as the fires of war are spreading, Momo has a fateful encounter with Fine, a Vampire Queen who once loved humanity...