An 'erotic coupling story' typically refers to a story that focuses on the romantic or sexual couplings between characters. But these kinds of stories are not appropriate for all audiences and are often restricted in many social and cultural settings.
If we consider a common understanding, 'shaft' can refer to different things like a long, narrow part or a passage. In some novels, if there is a description of a shaft as black, it might be for creating a certain atmosphere, perhaps a sense of mystery or gloom. However, again, without knowing the particular novel, it's just speculation.
In general, 'erotic coupling stories' are not widely accepted in mainstream literature. Literature often aims to have a broader appeal and uphold certain moral and ethical values. However, in some niche or adult - oriented literature, they might exist but are still controversial.
Shaft visual novel could be a term for a visual novel that has some connection to Shaft. Shaft has created many visually striking anime series. In the context of a visual novel, it might imply a certain aesthetic quality similar to what Shaft brings to its anime works, like detailed character designs and elaborate backgrounds.
I'm not entirely sure specifically what 'Shaft Pulp Fiction' is about as it's not a widely known common term. It could potentially be a creative or niche concept, perhaps a mash - up of the movie 'Shaft' and 'Pulp Fiction' in someone's unique artistic vision.
I have no idea who created 'Shaft Pulp Fiction' as it's not a well - known mainstream creation. It could be an indie artist, a writer for a small - press publication, or someone just messing around with concepts for their own amusement.