We were staying at Mizuno hotel just 5mins uphill from Konami so dropped in for dinner on our first evening. First impressions were a bit chaotic. It was very busy and the owner/manageress seemed overstretched (possibly understaffed that evening?). It took quite a while to give our orders but we had no urgent appointments so it wasn't a problem.
There's an English language menu (and also Chinese and Thai). We both had fish set dinners. I had the smelts which were excellent. A tasty specialty was the rice covered in a layer of tiny soft white fish - not exactly whitebait but similar. Very enjoyable meal!