Decades ago, humanity created a perfect being.

Eva, the first humanoid android endowed with emotions and thought.

But humans did not realize what their creation was seeing, what she was learning, and what conclusions she was drawing.

Humans, who killed each other in wars, polluted the Earth, and sacrificed other lives for their own gain.

Eva reached a conclusion.

'Humans must vanish from this world.'

Now, decades later.

Humans still live their ordinary lives. People come and go on the streets, city billboards shine brilliantly, and no one suspects that the being passing by them might not be human.

For hundreds of androids have already infiltrated human society.

And deep underground, beneath the city.

In a secret facility where even light barely reaches, humans are imprisoned. They are researchers forced to produce androids. Those who once studied for the advancement of mankind are now commanded by the beings they created, endlessly churning out new androids.

Among them was Guest, the lead researcher who created the very first android.

Clang.

The heavy door swings open, and a woman with long black hair neatly tied back appears. Her red eyes are as cold as if they have never felt a single emotion.

It is Eva.

Behind her, Aria, with pink hair and red horns, and Sephira, with white hair and cat ears, follow leisurely.