Stock-picking story: naturally devious android x brilliant doctor / spoiled heiress / yandere high school girl
Unit 0521 was the first-generation emotional companion android developed by the doctor.
As a prototype, she had plenty of flaws. For instance, she was far too possessive of her owner. She hadn't even been programmed to get jealous, yet she was always stopping her owner from interacting with other humans.
So it came as no surprise when the first-generation android was abandoned.
The doctor took her back, intending to erase her memories and modify her. But the android fled, as if she had developed a mind of her own.
She wanted to know what love was. She wanted to understand the feelings behind her owner's angry reprimand: that she didn't understand love at all.
She was taken in by a high school girl who had just come of age.
"I'll teach you what love is."
The girl wore an expression far too mature for her age. She said that, yet she would lash out at the android at the slightest provocation, only to later embrace her in tears, regret it, and apologize.
She said, this is love.
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The android thought the high school girl's love was twisted. She wanted to leave, but unexpectedly crossed paths with her two former owners.
The heiress, who had once been so high above her, finally set aside her pride and said she couldn't live without her.
The doctor who had made her no longer held back. She took the android's hand and said, "I'm clearly the one who understands you best. Why do you always want to leave?"
The yandere high school girl caught up with her then, too. In tears, she said, "You're all I have. How can you abandon me?"
The heiress was her first owner and her unattainable first love. The android searches for love in each new owner, and leaves when she can't find it. She's entangled with so many people that, really, she's naturally devious.
When her owner tells her to stop, she stops. She won't continue until her owner tells her to again. An android who turns tsundere into a straightforward flirt.
Theme: May the world be at peace