The story's servicable until you get to the antagonists the "Dominator Empire." Just from the Sexual Violence tag and Synopsis you can guess exactly why they're the antagonists. They're so one note it's almost insulting as a reader. I guess the author couldn't think of any better story or reason at all for us to hate them that they had to add a rape scene every other chapter and blame it on their society. They don't try to pretty it up either with imagery or metaphores, they just straight up show those scenes and give us those creepy close up shots of blood sputtering out like a hammer on a fruit gusher in an attempt of what i can only assume to be some kind of dark fan service. It's the cheapest most lazy way possible to make a reader hate someone or something and really shows how incompetent of a writer one can be.
Rape can be in a story, it can be used for a character's backstory, no one is saying it can't. It happens in real life and we use it in media to really emphaise how real a fictional world can be, just like indiscriminate genocide or slavery. They can be used as a tool for story telling just like an abusive household or even something as wholesome as raising an adopted child are tools. It's just the constant use of it as a crutch for laziness is awful.
Other series has this problem too, but this is the one that really made me mad. The other stories that used rape badly like the infamous Sword Art Online scenes didnt annoy me as much because those were just par for the course with how awful they were spiralling down like a flaming plane with a broken rudder. I loved how fun the mechs were, I just wish they were in a better story