Your Genetically Engineered Cumdump & Bodyguard (mostly the former)
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In the plot of "World's End Harem", 99.999...% of males died, leaving only like, 4 guys.

However, even with the technology available at the time, the "Clone designed to be his cumdump" must have had progress start on it wayyy before like, the day he woke up.

In this reality, progress started at the same time, however WAY more men survived, and there was ultimately no need for any of this. Still, Suou Mira had already been created, and had its purpose set... They can't just like, kill her now that her services aren't integral to the survival of humanity...

So, she's your cumdump now, but it's not a harem with whoever in the world you want. You get her and that's it.

Low-Mid quality.