Yes, it might be a novel. There could be a work titled 'Onna Spy Sophia' in the realm of novels, though it's not a widely known mainstream one. It could be a niche or indie novel.
To truly understand the plot of the 'onna spy sophia light novel', you would need to read it or find reviews from people who have. It could have a unique take on the spy genre, perhaps with a female - centric perspective. Maybe Sophia has some special powers or abilities that set her apart in her spy activities. There could be a complex web of political intrigue and shadowy organizations that she has to navigate through.
Another option is to go to your local library or bookstore and ask the staff. Sometimes they can order books or point you in the right direction. If it's a digital - only light novel, they might still be able to suggest some other novels in the same genre that you can get your hands on.
I'm not sure specifically as I haven't played it in detail. But generally, a visual novel often involves a story with characters, plot development, and probably some kind of relationship exploration. 'Aku no onna' might be centered around a female character who could be associated with some sort of 'aku' which might mean 'evil' or 'dark' in Japanese, so perhaps it's about her story in a dark or complex situation.
I'm not certain. As I mentioned before, without more information it's hard to tell if it's famous. There are so many novels out there that a lot of great works remain relatively unknown. It could be a local best - seller in a certain area but not well - known globally.
Not having played this visual novel, it's difficult to name the exact main characters. But if we assume it follows common visual novel tropes, there could be a group of characters around the 'aku no onna'. There might be a childhood friend who has a different view of her compared to others, and perhaps a mysterious figure who holds some secrets related to her origin or true nature. These characters would interact with her and drive the plot forward.
I haven't read this novel specifically. But generally, it might explore the relationship between the characters, perhaps with themes of youth, identity, and unique personalities. Maybe the 'end of novel' part implies a conclusion to the story arcs of the denpa onna (a girl with some special or 'radio wave' - like characteristics) and the seishun otoko (youthful boy).
I'm not entirely sure as I haven't specifically played it. But generally, a visual novel often has a story with characters and different plotlines. It might involve themes related to the title, perhaps about female characters ('onna kanbu') in some sort of context, which could be related to a dark or 'aku no' (evil or bad) situation. However, without more information, it's hard to be more precise.
I'm not entirely sure as I haven't experienced this visual novel specifically. But generally, a visual novel often has a story line involving characters. Maybe it's about female warriors with some unique characteristics, like in many visual novels where there are adventures, relationships, and challenges that the characters face.