I love the concept of a family oriented business as this usually indicate that each and every staff are fully dedicated in bringing their best towards prospering the business. This is not a common feat these days as most family members would have their own aims/objectives which may not even cross paths with anyone else in the family.
At my recent dinner visit here, I was served by the owners (a Japanese couple in their 50-60s?). As these two operate the entire shop by themselves, I strongly suggest having some patience as it can get crowded and the owners can only do so much with their pair of hands. If you are hyperactive like me, why not browse around the shop?
There are a variety of edible Japanese products on the shelves and I am sure at least one item will grab your attention;) To order sashimi, head to the fridge section and pick out which marine protein you want, bring it to the counter and either 1)dine in or 2)take it away.
If you opt to dine in, the owner/chef will prep your meal on a plate and bring it to your table. Also, there is a menu with other common dishes such as takoyaki, okonomiyaki and miso soup. A very simple menu and not too difficult to digest.