Didn't know that we got so many Snowflake reviews, but it won't be the first time that works get badly rated for superficial things. I'm just gonna say for all readers who are about to begin to read this work:
The ecchi part isn't forced nor is it the main point of the story. It is rather a small fan service addition and a very small one at that. The sexual violence obviously is just a element to emphasize the difficulty of the situation. So it is not something that is supposed to make you sexual erected, but rather it is supposed to make you disgusted and feel empathy for the people. The start of the story feels kinda weak, but it does get better. So give it a chance and don't push it away to early. If you are a fan of darker stories like Gantz and Survival themes like Promised Neverland, I do think this work isn't bad.
So far i would rate the story this way:
Art 8/10
Plot 7/10
Overall 7.5/10