Shortening your story could be necessary for various reasons. It might be to fit a specific word limit, to keep the pace fast and exciting, or to focus on the key elements and make the plot tighter.
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.
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.
One way to shorten a story is to remove unnecessary details. For example, if there are long descriptions of scenery that don't directly impact the plot, get rid of them. Another method is to combine or simplify characters. If there are minor characters who don't play a crucial role, merge them into one or simply omit them.
First, study the character of Griff from 'Baby Driver'. Notice his mannerisms, his dialogue, and how he interacts with other characters. This will help you write him accurately. For example, his tough - guy attitude and his loyalty to the wrong side in the movie.