The empire of the Golden Age has long since passed away, leaving behind a heap of smoking rubble atop high-energy ruins. The connections between the multiverses have been severed. A river spanning space has been split into dozens of streams, and fish rot and stink in its withered channels.
The industrial worlds have lost the agricultural worlds, and the agricultural worlds have lost the industrial worlds. The races that depended on humanity have lost human technology. Time has made catgirls less adorable and returned vampires to their true nature. Of course, please don't mistake this for a tragedy. Humanity wasn't around when any of it happened.
The story begins with the adventure of a catgirl.