Ok, first off let me say I am not at all terminal savvy. If there's a better way to do this that some of you know about please let me know so I can revise the instructions. So like Jey said, the general goal is to mount the .pnd of narcissu so you can view its contents. after that copy its contents into narcissu's appdata folder. Then copy files of another Nscripter compatible game into the narcissu appdata folder overwriting a few files in the process. The .pnd will see the files in the appdata folder as local and will launch the new nscripter game you put in the folder. To do this:
1. Make a folder somewhere on your SD card, preferably near the root. for this tutorial we'll say we named it NAR and put it on the root of the SD card.
2. Use thunar to navigate to wherever your Narcissu pnd is, once you're there, right click and then click "open terminal here".
3. Now, type "sudo mount -o loop narcissu.pnd /media/(SDcardname)/NAR(or whatever you named the empty folder)/" without quotations. So for me it looked like sudo mount -o loop narcissu.pnd /media/NONAME/NAR/ (If you get an error about "no free loop devices" just restart and it should fix it.)
4. If everything went correctly you should be able to navigate to /media/(SDcardname)/NAR/ and see a bunch of Narcissu's files. Copy all of the files to /media/(SDcardname)/Pandora/Appdata/narcissu.evildragon/ (if your directories' names differ, change accordingly).
5. So now you should have a bunch of files in Narcissu's appdata folder. What you want to do now is copy files from a different visual novel into this directory. Just to show an example, what I did was get my .img of the VN, mounted it, explored the files of the .img and then copied all of the files on the root of the image to Narcissu's appdata folder. Make sure you look for some files with the same names as some of the files in Narcissu's appdata folder to confirm you're copying the correct ones, nscript.dat is one to look for. When you copy the files of your VN a few of Narcissu's files should be overwrited.
6. after that, simply run Narcissu like you normally would and it should boot up the new visual novel. It is quite a workaround and isn't very convenient if you want to have a bunch of different VNs but it does work. The only problem I've seen is that, like many other pandora games, the screen doesn't display correctly and is a bit too large vertically. you can move the window around by holding shift and dragging with the mouse to position it how you want. If you have any questions or problems, feel free to ask.
Edit: also, thanks for the link. People seem to be very fond of tsukhime, so I'll try that one out.
