The largest problem with this anime is the story and the characters. They just aren't very fleshed out. One basic component of making a character is making them have reasons for doing things. This is extremely obvious. Why does the princess hate the MC enough to spend extreme amounts of effort abusing him over several years? Beats me. The anime never really goes in and explains these basic things about it's characters, and as a result investment in them becomes difficult. From a more meta perspective the reason is clear, of course. Because the writers need some sort of moral justification for the upcoming r*pe/torture scenes. But that's an out-of-universe explanation. There isn't really any in-universe explanation and that's a problem. It gives the viewer the feeling that the story was just an after-thought and that the sex-scenes is everything the creators cared about. Those priorities don't make for good anime, sure, they make for good hentai, but this anime clearly wants to at least pose as something more than fap-material.
Characters don't need to be deep, not all entertainment needs to be deep, but it should at least be entertaining. If i asked you to describe the MC of "kaiyari," what would you say? He's mean, he's angry, holds a grudge? He doesn't really have any notable traits that make for an entertaining viewing experince. He's just a blank slate with anger issues. What was his early life like before he became property of the princess? Did he have values, dreams goals? What were they? Does he have any funny or interesting quirks? If you saked me these questions about the MC of other fantasy-shows, even less "deep" ones like KonoSuba i could answer these questions. With Keyaru i can answer none. It seems like the protagonist was nothing more then an after-thought. This is bad, an anime is nothing wihtout a strong lead.
The anime also fails at basic world-building. How does magic work, why is the MC's magic so strong? What cheat has he discovered that allows him to do literally anything? No answers. There's a time-skip and after that the MC's powers are completely broken, what are the mechanics behind that? Even in some of the most generic shows such as "The Irregular at Magic High School," how magic functions is actually explained. It's not an after-thought and is as such way more engaging. This anime fails completely in this area as well. It is clear that everything except for the sex-scenes are a complete after-thought in this anime. I expect that kind of behaviour in hentai or pornos, not in a non-hentai anime from a major studio.
TL;DR:
This anime fails in basic character- and world-building, and as such i just can't take it seriously or be invested. As a result i don't see this show as "dark" or "too tough for normies" a dark show makes your stomach turn, it makes you feel bad. This show is too lazily written to do any of that for me. I guess it could work as fap-material for some people but it is certainly not a good show. Unless you're watching it with your d*ck in your hand you won't get any value at all out of it. You won't see me walking around pretending that this show is good or has anything going for it just so that i can "piss off the SJW's". I'm not that infantile.
