Yeah, you are really going to need another drive at some point, at least an external for everything other than your system files. Who ever set that up was just mean.
It should be possible to replace that one, clone it to the new one, while increasing the usable partition. Though an external would be a lot easier.
My assumption is that is a mix of both, it's hard to have one without the other after all. Each girl has their own take on the world, they were all exposed to it in different ways, and so delving into each girl's story, you learn about a different aspect of the world, from a different perspective.
...or maybe I just love world building myself, so it impresses me how much work went into this one.
