One reason could be that its distribution was limited. Another possibility is that there aren't many reprints, making it scarce. Also, it might be more popular in certain regions and less accessible elsewhere.
The plot twists in 'kamisama no memochou light novels' are really engaging. There are many unexpected turns that keep you on the edge of your seat, making it hard to put the book down. Also, the world - building is quite detailed, creating a vivid and immersive setting for the story to unfold.
A common theme is the slow - burn romance. Given Kurama's initial aloofness and Nanami's determination, their relationship often develops gradually in fanfiction. Another theme is Kurama's past affecting their relationship. His history can add depth and drama to their interactions.
In such a fanfiction, it could be that the pregnancy brings out a new side of Tomoe. He might become more domesticated, learning to cook special meals for Nanami. Nanami would be glowing with the pregnancy, and their relationship would be filled with new - found tenderness. Their friends in the spirit world and human world would also be involved. Mizuki might give Nanami some unique gifts for the baby, like a magical amulet for protection. Kurama could offer his wisdom on how to raise a child with powers. The whole story could be about how this pregnancy not only changes their lives but also the relationships they have with those around them.