There's a file gameguide.png listed, but no link or button to download it.... I've managed to get all the CGs except #11. That one looks to be on the "steal the diamond" path but I've done all of those.
Game walkthrough added.
We've added a walkthrough to make it easier to complete the gallery ❤ In order to make avoiding spoilers as easy as possible, we've made it a separe .png file. Please keep in mind that the very last four thumbnails are meant to remain empty, only the ones with the "access denied" have unlockable CGs.