Another good place to find local publications is at international centers located in various locations around the nation. The basic stations are all in Japanese, although they occasionally show foreign sports and TV programs. Japan and cameras go together like rice and miso soup. Japanese social protocol requires a few shots be taken at any social occasion. The country produces a lot of camera equipment and film, so it's not surprising that both are readily available.
Slide film is available as well, but is more expensive then other areas in Asia.
Japan is also the world's largest producer of VCRs and video recorders. It is possible to find video equipment that can switch between the three systems, but only in commercial electronics areas like Akihabara in Tokyo. It's probably cheaper to wait and get your film developed when you get home, but if you just can't wait, printing film is fast and easy in Japan. Prices and quality can vary but most shops can process your film within a day.