Being Ecchi and Smut isn't an excuse for paper-thin world-building and characterization.
The plot is so far just a poor excuse to show a short rape scene. I've seen literal rape porn that put more effort into the backstory, and that had high quality sex on top of it.
This is why this gets bad ratings from a lot of people, not some imaginary prudishness.
We clicked on this because we wanted smut. Not shit.
That said I gave it 3 stars, since art, dialog, setting, paneling etc are servicable. I guess most of the 10/1 nonsense is just a war over the average score.