Full title: AC by Lake Aibillis: The Shiva Project.
Five hundred years ago, the Second-Generation Humans were attacked without warning by the extraterrestrial civilization known as the Watchers. Ninety percent of humanity evaporated into bubbles, while the survivors abandoned their physical bodies and launched the Avatar Project.
Five hundred years later, the Avatars, having gradually lost their emotions and become more and more like machines, surviving solely through their avatars, are forced to face the Watchers' judgment after five long centuries.
On the eve of the trial, a gentleman rescues a girl from the fire-lit ruins. She calls him Father.
A human.
