On top of finding out which products are in high demand in Japan, I would investigate, among other things, the following;
- The regions of Japan which have the largest market for the product.
- The current supply deficit in the market for the product.
-The demographic composition of the consumers of the product.
- What the new entrant in the market needs to improve on the product.
- The capital estimate and profit margins necessary for the business
- Compliance; Legal, procedural and ethical requirements of the industry in which the product is categorized.