I haven't read it specifically, but often light novels can have themes like friendship, self - discovery, and adventure.
Since I don't know the exact details of this particular light novel, in general, light novels may also explore themes of the supernatural or fantasy elements. If 'abide by the wind' has such elements, it could be about how the characters interact with a magical or otherworldly world, and how that changes them. It might also touch on themes of loyalty, as the characters may need to stay true to their beliefs or friends in the face of difficulties.
Common themes in light novels include coming - of - age stories. So in 'abide by the wind light novel', it might be about the protagonist growing and maturing. There could also be themes related to the power of determination and the importance of relationships. For example, the characters might face challenges that test their friendships and through that, they learn more about themselves and their place in the world.