(Inu to Hasami wa Tsukaiyou, Shunsuke Sarai (author), Kamon Ohba (art), 2012-2014, 4 volumes) AKA “Dog and Scissors”
This is probably the most incomprehensible manga I've read (not in a good way). Try reading this:
The protagonist, Kazuto Harumi, is a huge bookworm. One day in a cafe while he tries to protect a girl from a gun-toting criminal he got shot and killed. But his unquenchable desire to read books cause him to reincarnate... in the form of a dog. The only person who can understand his words is the girl he saved earlier, who seems to be a big sadist with a pair of unnaturally sharp scissors. Hence, Dog and Scissors. He then founds out that she, Kirihime Natsuno, is actually the writer of his favorite book series. As they live together they talk about writer and reader's philosophy, making obscure references, but more often it's just she threatening to kill or castrate him the moment he gets a bit cheeky.
The story then changes into detective mystery genre as they try to search Harumi's killer. After correctly deducing his position it turns out he has turned a new leaf after he read books and he is resisting arrest because he want to read more books and he is now able to do the martial arts from books that should be impossible to do real life. After he is defeated then Harumi and Natsuno talks about the nature of vengeance. But it turns out the root of the problem is that the cafe owner is a drug dealer. And let's not forget about Natsuno’s masochist editor and Harumi's yandere little sister who wields a tuna knife that can transform into a chainsaw and a bazooka.
As you can see, this is a mishmash of a LOT of ideas and genres, mixed into an incomprehensible mess. This is actually a pretty common thread of Light Novels (this is adapted from a Light Novel). They mostly feels like a young writer's first draft of the first unpublished novel: A few good ideas, tries to combine many things they feels cool, references to things they like, with few thoughts of classic narrative beats.
It doesn't always comes out bad, and sometimes the core ideas are strong enough to sustain the whole thing, but this one is definitely one of the worst I've read so far.
Another specific disappointment: I'm disappointed that for a writer-reader pair, Harumi and Natsuno make almost no literary references at all, and instead using references from manga and games. Not that it would make it any better.