Eh, my skills and style probably match your needs, but I'm way too busy to do other work, and I actually develop my own feudal Japanese dark fantasy setting as an imprint under Rite Publishing, for the Kaidan setting of Japanese horror (PFRPG) . Also look at my signature at bottom of this post. So my interests already lie in this genre, but I'm dedicated to doing my own setting. Our first adventures for this was published in 2010, and following a successful Kickstarter last summer, our setting guides will be released Oct/Nov 2013. I'm actually creating authentic floorplans of specific Japanese locations (already released a Japanese bath house) with prebuilt encounters as adventure sites.
What system are you using for your Japan setting? Just curious.