The first chapter in a novel written by Hitohira (from Shimensoka) and illustrated by Hota. (from Iyokan.) involving Maribel and Renko, their world and Gensokyo, and dreams and reality. I rotated the original images 90° counterclockwise because that was the easiest way to fit in the English, so you may have to rotate them the other way if you want to see the illustrations correctly. Thanks to Lunar972 for the raw.
Edit: I put up a slightly cleaner version.