A decently interesting premise which gets destroyed by Urobochi's common writing problems, turning it into an edgefest of misery porn and simplistic messages/themes which try to paint themselves as smarter than they truly are. All of this mixed with a pretty poor narration makes for a not particularly interesting read. Unless you are just interested in seeing gross scenes.

The characters are all obsecenly one dimensional or extremely unlikable, with the exception of Saya,who is somewhat ok. But has the most cliched and predictable character arc you could imagine.
Fuminori's characterization is just being an asshole and needing Saya. Although his relationship with her has some Interesting stuff: the short lenght, how unlikable he is written as and the VN's need to make everything as obscene as posible ends with him being a character you would much rather not have to deal with.
The other characters are not worth mentioning as they are all basically non existant

On a technical level it does actually stand out, the CGs are certainly well drawn and fit the oppressive atmosphere the VN is trying to present, which alongside a strong OST that fits the tone perfectly allows some moments of the VN to be somewhat saved from it's incredibly weak writing.