wow theres costco in Japan and your member ID is accepted globally, cool!
where do you store all the bulky quantities in those tiny Japanese minimalist homes?
It was hard in an apartment but my rental house was fine (~55m^2). I bought a chest freezer and vacuum sealer. I recently bought a house in the countryside that is honestly more than we need (my wife and I both have offices and we still have an unused bedroom and another room). Some people will shop at Costco and split things and that works out pretty well.