Japan is a notoriously difficult market to crack. Successful, established businesses entering Japan from overseas that do not bother to tailor their marketing and product for Japan regularly fail here.
Notably however, Japan's SaaS market is bigger than every other SaaS market in Asia combined. If you put in the time and effort to battle through the adversity, there is a wide range of fantastic opportunities here generated by criminally under-served market segments.
Whether you're looking to expand your existing product to this large potential market, or simply looking to target it directly (hopefully after moving there and spending a few years absorbing the culture), this article will come in handy.
The article covers things like how to get feedback, how Japanese consumers make decisions, how to deal with Japanese people's sensitivity to "Japanese-ness", and how to provide the levels of customer service that Japanese consumers expect.