There was a maki that was said to be a ghost. It haunted a particular forest. Hunters would often report seeing a white, maki - like figure darting between the trees. Some thought it was the spirit of a maki that had died in that forest long ago. One hunter even claimed that the maki ghost led him out of the forest when he was lost, as if it had a kind heart despite being a ghost.
Well, it's hard to say. The story is full of surprises and twists, so it's difficult to predict Maki's fate exactly. You might want to keep up with the latest chapters to get the definite answer.
Yes, they could be. Japan has a rich folklore tradition, and since maki is a Japanese food, it's possible that there are some local tales or superstitions related to it that could be considered maki ghost stories. For example, in some small fishing villages where maki ingredients are sourced, there might be stories of sea spirits interfering with the making of maki if fishermen don't offer proper respect to the ocean.
Since I don't have much information on this particular 'maki chan to nau visual novel', it might be a story that focuses on the characters of Maki Chan and Nau. Maybe it's a love story, or it could be about them facing challenges together. It could also be set in a unique fictional setting that the developers have created specifically for this visual novel.
One common theme is friendship turning into something more. Since they are friends in the original series, fanfiction often explores the idea of their relationship evolving romantically.
It's possible that 'Split' is a novel. However, without more details, it's hard to say for sure. Maybe it's a title of a lesser-known work or a self-published piece.