I'm not sure specifically as I haven't read this light novel. It could be about a character named Aoi Hikaru and their adventures on Earth. Maybe it involves some sort of fantasy or science - fiction elements set in an Earth - like environment.
I'm not sure specifically as it could be a very niche or even a made - up title for a novel. It might be a love story set in a particular school or place called 'binan koukou' and perhaps related to earth defense ('chikyuu bouei bu') in some way.
Since I don't have much information about this novel, I can't say for sure who the main characters are. But it's likely they are students or members of the earth defense unit from 'binan koukou' based on the title.
I'm not entirely sure as I haven't read this specific light novel. But generally, a light novel often involves unique characters, a fictional world, and a story with various themes such as adventure, friendship or self - discovery. Maybe it's about the journey of Aoi Hikaru on Earth.
The 'European' aspect of these fanfics also enriches the fandom. It helps fans to better understand the different European cultures that are represented by the Hetalia characters. For example, a fanfic might describe in detail how a character's behavior is influenced by their 'national' culture in a European context. This can lead to more in - depth discussions and a greater appreciation for the Hetalia concept among fans. Moreover, the exploration of gay relationships can break some traditional relationship norms in fan works, making the fandom more inclusive.
Probably 'Axis Powers Hetalia'. It has a large fan base. Its popularity lies in its creative concept of personifying countries and the comical interactions between them.
You might try looking for it in local bookstores that carry a selection of light novels. Some large chain bookstores often have a section dedicated to Japanese - style light novels.