When I first arrived in Zurich I immediately went to this place to stock up on some Japanese essentials. There is a Japanese food corner in Globus and Jelmoli but the selection is by far the most extensive at Nishi. You can buy rice in bulk (up to 10kg) and you can find fresh ingredients such as lotus root and proper tofu (not just the tetra pack kind). I was most happy about the ice cream and spent a few minutes wondering how much trouble they must go through to bring frozen goods to Switzerland from Japan.
If you’re looking for some Japanese bits and bobs for around the house like little decorations and kitchenware, then Nishi most likely has what you’re looking for. If you’re a Japanese television drama and film fan you can rent DVDs for CHF 4 or so. It may be a small shop, but it’s equipped with a myriad of nostalgia inducing objects for the Japanese residents of Zurich. For non-Japanese visitors it provides a great selection of food to get acquainted with.
Don’t forget, there is much more to Japanese food than sushi so get yourself over to Nishi to stock up on the alternatives, such as natto and Japanese pickles.