Recipe Doujins
These are a set of four unofficial Kindred Spirits doujins released by the creators of Kindred Spirits: Peg (character designer), Mutsuki Tatara (writer), and Toitentsu (planner). Published from summer of 2012 to spring of 2013, they each contain a manga section, a short story section, and a section that expands further on the details of the game's characters and universe.
On Content Presentation
Some artistic liberties have been taken reformatting the doujin content (outside of the manga sections) to be in a more web-friendly format. This mostly involves the coloration of some originally grayscale elements to match the site's aesthetics (headers, etc.), but some elements (the school maps) have been remade from scratch using the original media (and other media posted online by Toitentsu) as reference. However, all changes are only visual in nature; the actual content presented is identical to that the original doujin (minus the translating, of course). If you'd like to note the changes, the original scans are available in the "Archive" portion of the site.
Winter Recipes
Published 12/31/12
These doujins have been translated by others, but haven't yet been integrated into the site. Do note that I haven't looked them over, so I can't vouch for their accuracy.
Summer Recipes
Published 8/12/12
Fall Recipes
Published 10/8/12
WIP corner of shame:
Spring Recipes
Short Stories
As part of official promotions for the game's release, Mutsuki Tatara (the game's writer) penned a few short stories for various publications and merchandise. They also wrote an unofficial short story for YURITOPI-EARTH (Toitentsu's blog) to commemorate the game's one-year anniversary.