In many light novels, the plot unfolds gradually as the story progresses. It might start with introducing the main character, Iroha Isshiki, and their situation. Then, there could be a series of events that lead to a change in their life. This could be something like a new discovery, a meeting with an important person, or a problem that they need to solve. If there are other elements such as a love interest, it would add another layer to the plot. However, without actually reading the 'iroha isshiki light novel', we can only speculate about the possible plot elements.
It could also be related to a prophecy or a pre - determined fate in the fanfic's plot. There might be some kind of dark prophecy that says Kawaki has to kill Naruto to prevent a greater evil. Or perhaps Kawaki is being controlled by an external force that has a vendetta against Naruto and uses Kawaki as a tool to carry out the murder.
One common theme is friendship. Writers often explore how Himawari and Kawaki, who come from different backgrounds, form a bond of friendship. Another theme is growth. They both grow as characters, learning from each other.
Kawaki makes his appearance in Boruto manga at a specific point, but I can't recall exactly. You might want to check the official manga sources for the precise chapter.
I'm not very familiar with a specific 'iroha isshiki light novel'. But you can try searching on some well - known light novel platforms like J - Novel Club or Amazon's light novel section.
One common theme is growth. Both Himawari and Kawaki are often depicted as growing both as individuals and in their relationship. Another theme is acceptance. Since they come from different backgrounds, fanfictions usually show how they accept each other's differences.
One great 'kawaki naruto fanfic' could be one where Kawaki has to learn a new jutsu from Naruto. In many fanfics, Kawaki is often portrayed as a complex character trying to fit into the Hidden Leaf Village. He might struggle with his past and Naruto could be the one to guide him through it.
In such a fanfiction, perhaps Kawaki is driven by some extreme ideology. Maybe he believes Naruto's way of peace is a weakness and decides to take him out to change the ninja world in a more radical way.