My company is an international business development consultancy with partners in 50 countries around the world. Our purpose is to help businesses enter new markets.
One of my key specialty markets is Japan, where I personally lived and worked for some 16 years, and where I maintain good partners for developing routes to market.
I can tell you that what you don't need, is contact with retailers in Japan, and what you do need is a good distributor with contacts to retailers, so they can handle those processes for you. Without trying to make a pun, you have to also bear in mind that as your products are handmade, we need to consider capacity.
The service I can offer is to test our routes to market, to gain an understanding of interest, and this can be undertaken at no cost to you.
We are quite happy to work on a project like this on the basis of commission (i.e. we only earn if we sell), and we keep our commission at sensible levels, so you keep a good margin.
Feel free to contact me to discuss further at: firstname.lastname@example.org
All the best.