Yes!
There were a few:
- Shiki is an adventure taking years, following your lord from youngster to adult. As adventures go, it is okay and very suitable as an introduction to the style. ISBN 1-890305-19-7. You can find an overprice copy on amazon. Note that at the price of this writing (£74.95!!!), it is not worth it! The original price was $16.00. I would not lose sleep over this, shiki was okay, nothing amazing.
- Shinobi, Shadows of Nihon and Shinobi Ryu are all about ninja. Both those are incredibly well researched using history over urban myths. Those are a superb addition to anyone wanting to actually learn about shinobi. The references alone are worth it!
- Sengoku Character Sheets is a tiny supplements with nice character sheets. I cannot comment on this one as I do not own it.
You can (and should) get them here in pdf form….
As a side note, Sengoku is probably the best games dealing with the warring state period of Japan history. It is chock full of accurate historical research. While the system is meh, you can easily ignore it and run it with whatever your favourite is.
The $5.99 bundle will have it all but Shiki. At that price, I strongly encourage anyone reading this to pick it up. I would (and did) pay at least ten times that price and it was worth every penny!
I am neither associated with Goldrush games (although I was involved in both the alpha and beta for Sengoku) nor am I associated with drivethrurpg.