It's about a world filled with Gems. They live in a place where they face various threats, especially from the Lunarians. The story in the light novel delves into their relationships, their growth, and how they cope with the challenges. For example, some Gems might be more fragile while others are stronger, and they all contribute to the overall story of their community's struggle and evolution.
The ending of Houseki no Kuni manga is quite complex and leaves room for interpretation. But basically, it brings some closure to the main storylines and character arcs.
One of the main characters is Phosphophyllite. Phosphophyllite is a young and somewhat naive Gem at the beginning. There is also Cinnabar, who has a rather unique and difficult situation among the Gems. Another important character is Bort, who is very strong and protective.
Another theme is identity. For instance, when crossed with 'Attack on Titan', the gems from 'houseki no kuni' may struggle with their new identities in a world full of Titans. They have to adapt to a harsher and more dangerous environment, which challenges their sense of self.
I'm not entirely sure as it could be a very specific or niche visual novel. It might be related to the 'Houseki no Kuni' series and involve a color - themed story or gameplay within the visual novel format.
An interesting plot for a Houseki no Kuni OC fanfiction could involve an OC gem that is not like the others in terms of appearance. This OC could face discrimination from some of the other gems at first. But as time goes on, they prove their worth by using their special skills, like being able to sense danger from afar. Maybe this OC gem could also form an unlikely friendship with one of the more popular gems, and together they explore the mysteries of their world, such as the origin of the Admirabilis.
Another option is to look on the official websites of visual novel developers or publishers. Sometimes they have exclusive releases or information about where to obtain their products. In the case of 'houseki no kuni color visual novel', it could be that the developers have their own site where you can find it.
For developing a unique character in Houseki no Kuni OC fanfiction, you need to think about their origin. Were they created by the same method as the other gems or was there something different? Their emotions are a big part of it. Maybe your OC experiences emotions more intensely than the others. Their physical characteristics can also be a differentiator. What if your OC has a flaw in their gemstone that gives them a unique look but also makes them self - conscious? And don't forget about their beliefs. They could have different beliefs about the Lunarians or the purpose of the gems, which would shape their actions and decisions.