I'm not entirely sure as I haven't read it in detail. But generally, a light novel often involves various elements like character development, a unique plot, and perhaps themes related to youth, friendship, or personal growth. It might be about a story set in a world where music plays an important role, given the 'orchestra' in the title.
Trans-Siberian Orchestra was formed to create a unique blend of rock and classical music with a focus on elaborate stage shows and holiday-themed performances. Their music often tells emotional and epic tales.
Since it's an orchestra - centered light novel, there might be a talented young musician as one of the main characters. This could be someone who is new to the orchestra and has to learn to fit in. There could also be an older, more experienced member who acts as a mentor to the younger ones. Another possible main character could be someone who has a special connection to the orchestra, like a person who founded it or someone whose family has a long - standing relationship with the orchestra.
I'm not entirely sure, but it's very likely. TvTropes is a comprehensive database for all kinds of fictional works. Given Konosuba's popularity, especially in the anime and light novel world, it would make sense for there to be a section about its visual novel on TvTropes. You could check by searching for 'Konosuba visual novel' on the TvTropes website.