Literally, 'kono' means 'this', 'oneesan' can be translated as 'elder sister' or 'big sister', and 'wa' is a particle indicating the topic. 'Fiction' means something that is made - up or not real. So it could roughly mean 'This sister is fictional'.
One of the main features could be the character development of the sister. Starting as a gal - like character, she may grow and change throughout the story. There could be plotlines about her making friends, dealing with school bullies or social situations due to her appearance and style. And of course, the relationship with her brother or other family members would be a central part of the story, with their interactions evolving over time.
In many anime series, there are characters that can be examples. For instance, in 'Sword Art Online', Asuna could be seen as an 'oneesan' - like figure in some aspects for certain characters, and she is a fictional character. So she can be an example where 'kono oneesan wa fiction' applies.
I'm not sure specifically as I haven't read this light novel. But generally, it might be about a girl who is not a 'bocchi' (which could imply not a loner or something specific in the context of the story). It could be a story of her adventures, relationships, or personal growth.
Well, 'kono aozora ni yakusoku wo visual novel' could potentially tell a story where the blue sky serves as a backdrop for the plot. Maybe the promise made in the title is between the main characters. It could be a story of growth, where the characters are bound by this promise and their experiences under the blue sky shape their development.
Well, it often has unique and engaging storylines. The characters are usually well - developed, with their own quirks and growth arcs throughout the narrative.
I'm not entirely sure as there could be multiple main characters, but typically they are characters who drive the story forward, like the protagonist who might be on a grand adventure in that world.
The 'class no bocchi gal wo omochikaeri novel' is likely a Japanese - inspired story. 'Bocchi gal' might refer to a girl who is a bit of an outcast or loner in the class. The 'omochikaeri' part is a bit unclear, but it could be related to some form of change or transformation in the character's situation within the class setting. Without reading it, it's difficult to say exactly what it's about.