UMI bar Shinjuku
As a tapas bar, it's fine. The volume of food is pretty light, and the service seemed a little slow, but the size and makeup of our group clearly overwhelmed them. We definitely came out ahead of what we paid. What bothered me was when I called they had no record of our Open Table reservation. Fortunately they were able to accommodate us, but I shudder to think what would have happened if I hadn't called. So yes, you can use them, but you'll need a Japanese speaking person to call because the Open Table reservation doesn't do anything. I asked, and they explained that Open Table reservations go to their main office, who doesn't forward them to the actual restaurant. That's a big problem, not with the restaurant, but with the restaurant's integration with Open Table.
UMI bar Shinjuku is rated 3.7 stars by 2 OpenTable diners.
Yes, you can generally book this restaurant by choosing the date, time and party size on OpenTable. Due to local restrictions, this restaurant may not be accepting reservations at the moment.