We went to Sumi Bio with some friends for drinks and finger foods. Luckily all of our friends were Japanese speaking because they didn't have an English menu and none of the staff spoke English!
Besides that, all of the food was really good and they had some great organic sangria and other drinks. The atmosphere was very nice and would be good for a night out. Our meat-eating Japanese friends even approved! Oh and it's pretty close to the Ebisu station too.
Cons: No English menu, Staff does not speak English