Characters:
Nitsu Akumu, Fan Yandeloid.
Hoshi Nozomu, Fanloid

The two were, essentially, two polar opposites. Somehow, they were close as sisters, and to people they seemed to define the phrase "opposites attract." But of course there can never be an occurrence without a story. And a story was definitely what the two had.

Nitsu Akumu, the lonely nightmare.
Hoshi Nozomu, the wishing star.

Nitsu was like a dark cloud of negativity, with piercing blue eyes that chilled people as she spread ice through their souls.
Hoshi was a positive burst of light and energy, her azure eyes constantly lighting up her face and her smile.

But though the two's personalities were different, they stuck together, and returned to their home at night. A home they felt they belonged to much more than the school and world they thrived in in the daylight. It was an underground laboratory, the indoors shiny with gleaming metal that reflected the little light in the base. The second the two arrived, they tackled their creator, who laughed and hugged them back. It was a perfect existence.

But also a hollow one.

It was Nitsu, ever thirsty for knowledge, that had first begun to pester their creator about letting the two leave the lab and live like "normal" people. Hoshi soon followed, bored with the books that she had read dozens of times. Their creator tried to stop them, but after a while, gave up, and the two artificial beings went to school.

It was hard to adapt for them, to pretend that their brains were the same as the others', and not supercomputers. They had to try and restrain personal urges and abilities that were usually welcome on a daily basis. Nitsu had to detach herself from everyone but Hoshi; should she get too close, she could lose control. Hoshi could not unfold her wings, and the grounded existence was quite uncomfortable. But the chance to live like normal people was incentive to go through this, and see the wonders of the world.

Their own creator had been a normal human for a while, before an accident in her father's lab modified her DNA and fused her with a cat. Her father had died, but the now half-cat girl survived, and created Nitsu and Hoshi to be her friends. The two were glad to stay with her, but they had to admit that after exploring all the rooms and learning everything they needed to know it got pretty dull.

Besides, their creator was growing older, and no doubt she would soon experiment more and find more friends to stay by her side. Nitsu had caught a glimpse of pink and green when she had sped past the main lab room.

The two girls sat in their class, sending each other quick and seemingly uninterested looks, their eyes clashing once every few minutes. After learning of their wanting to go to the surface, their creator had installed a program to send messages to each other without another computer assisting them. It had been very useful, even Nitsu had to admit.

And their life went on in the world, with a constant switch of schools. Their creator reached their age and older.

And the two knew that they, and their artificial minds, would always remain two sides of night.