There isn't guro/snuff in this in a technical sense but everything goes so far that it could be argued several scenes feature defacto guro ending in a brutal death. Beware: Your mileage may vary.
"The Punishment" chapter is where this comic lost me. I get that this series is supposed to be about extreme torture, and I don't have anything against non-con in a vacuum, but you don't just suddenly throw 100% unwilling victims into the story that so far had only willing or dub-con participants, and then act like it's nothing.
Dub-con and non-con require very different levels of suspension of disbelief (especially when you're dealing with extreme kinks), and suddenly switching from former to latter is a complete mood killer. Either establish that your story has non-con from the very beginning, or don't introduce it out of nowhere 280 pages later.
I do agree with MrNoobmnenie as far as that chapter being a real rough gear change, however with where it goes after that 'contractual-consent' it occurs to me that I can't think of a smoother way to transition form dub-con to non-con, as a contract is ostensibly consent to the terms of the contract, and by extension was happening to her.
Now you are saying 'don't do that transition', but I get the impression the initial couple was the original idea, found it didn't work (be that no ideas, or whatever else) and thus went back in time to spin up this club thing, and got themselves in a position where the dub-con exists, they don't want a new world/start, but perhaps found they actually wanted to (or felt the story would be worsened if they didn't) do non-con. Thus they needed to cross to non-con somehow. Hell the contract thing also makes it so those who don't want non-con can see it coming and leave before it actually gets there via the signposting. (the next arc just opens directly to non-con)
I was baited to this story with horny, but actually consuming it isn't horny, the details included suggest to me the author knows the practicalities of a lot of this stuff, on top of that the characters feel real, being human regardless of context. Like when Yuri is concerned about undressing in front of a man, and resolves this problem by undressing before he arrives. That kind of human irrationality, Interestingly while I think Ara may be my favorite character, she is also the least believable, she is too competent. I desire to know more about how she became how she is. This story I think is doing crazy things but without it feeling forced, like the actions make sense given who the characters are and the situations they find themselves. I want to dissect why this story is so fascinating to me so I can understand, but also fear doing so will ruin the magic.