First things first: This is not the cheapest import store in the city. With that in mind, carry on.
This is the most robust import store in the city. It has everything you'd need from Creme Brulee flavoured Kit Kat, to authentic Pocky. They have tasty rice triangles, and beautiful tea sets.
If you're looking for Udon, or other noodles (and have nearly given up out of frustration) this is where you want to go.
Finally - they have Pocari Sweat. A personal favourite of mine!