Mizu in Covington? Haven't been there but I drive by many times a week. http://mizusteakhouse.com/
I second this. I'll preface this statement by saying that I have a severe seafood allergy and therefore don't frequent Japanese restaurants much, limiting my knowledge of Japanese cuisine, but I've been to Mizu's in Southcenter a couple times, found the food to be of good quality, enjoyed watching the chef perform his tricks with knives, sherry, and sesame oil. Kinda expensive ($30 a plate, roughly), but these places usually are.