I'm so excited that a friend introduced me to this place! I returned to Arizona in September after living in Japan for two years, and I had yet to find a lot of the "staple" foods I enjoyed there. Nagasaki Grill offers really authentic udon, ramen, tonkatsu, curry, etc. The plain but comfortable inside is authentic too. Eating there felt just like being back in Japan.
It's important to note that Nagasaki Grill's food is in no way "fancy" or upscale. It's what you would expect if you walk into a small neighborhood joint in Japan where locals grab a quick bite after work. In other words, just good plain food. The service is quick, but the husband and wife run the place alone and don't fawn over guests at all.
I would give Nagasaki 5 stars, except that it's SO uncomfortably quiet in there. I had to whisper so my voice didn't echo obnoxiously. :)
I can't wait to go back and try the rest of the menu!