The main plot of Hosik's story could vary greatly. Maybe it's centered around a goal he was trying to achieve, like getting into a good school or getting a particular job. It could also be about a relationship that was important to him, for example, a relationship with a mentor who changed his life. Without knowing more about Hosik, it's difficult to determine the main plot.
Since we don't have more details about 'Hosik's Story Fiction', it might be a story that focuses on Hosik's growth. Maybe it tells how he overcomes difficulties in a fictional world, like facing strange creatures or dealing with complex social situations within the story's setting.
A 'historia visual novel' could be about various things. It might be a story set in a historical context, with characters and plots that unfold in a way typical of visual novels. It could focus on a particular era, like the Renaissance or the Victorian age, and tell a fictional story with elements of that time's culture, society, and events.
One common theme is self - discovery. Hosik often goes on a journey where he learns more about himself. Another is friendship. He makes friends along the way who help him in his adventures.
Yes, there are quite a few. You can start by looking on fanfiction.net or Archive of Our Own. Some fanfictions might explore their relationship in an AU (alternate universe) setting, like a modern-day scenario where they meet and get married, while others could be more in line with the original story's themes and settings but with a different plot twist leading to their marriage.
There could be some, but it really depends on the market and the fan base. Since visual novels are a diverse genre, those with a historical focus might not always get the same level of mainstream attention. But in the communities dedicated to visual novels and historical fiction, there may be some well - known 'historia visual novel' titles that are highly regarded for their storytelling, art, and historical accuracy.