From the publisher:
The Winding Way is an epic adventure presented in Six (!) installments. Our gunslingers, houngans, and other heroes will get a taste of all the world of The Sixth Gun has to offer, including encounters with strange beasts and unusual characters, experience with the legendary guns themselves, and even a not-so-leisurely stroll through the spirit realm. Eventually they will be faced with choices that could reshape the West itself, maybe even the entire world.
The Winding Way is effectively a prequel to the events presented in the main comic book series.