It could be about various things. Maybe it involves a fictional 'fate' within a rather unappealing or gritty 'empire of dirt' setting. It might tell a story of characters whose lives are shaped by this unique and perhaps harsh environment.
I'm not sure as I haven't read it. But usually in a visual novel, there are protagonists who drive the story forward. They could be characters who are trying to make a mark in the 'empire of dirt' or those who are trying to change their fates within this setting.
Most BSD light novels often have complex characters. Since they are based on literary figures, they bring in the depth and complexity of those original personas. For example, a character might have the same traits as a famous writer but with a unique twist for the BSD universe.
The appeal of all BSD novels lies in their ability to create immersive worlds. They draw readers in with their unique concepts and engaging storylines. For instance, the way they handle character relationships is very captivating. The conflicts and reconciliations between characters make for a great read.
Honestly, there's no definite answer on when the BSD manga will end. It all comes down to various factors like the author's inspiration, the popularity of the series, and the publisher's decisions.