My girlfriend and I come in here regularly once every two weeks and I cannot understate how much of a hidden gem this place is. I was super skeptical of getting sushi from a place connected to a convenience store, but we keep coming back because the quality trumps all of the other spots in the area. We've tried Tokyo sushi and sushi ocean and they just aren't as good.
The staff are always friendly, they serve you quickly with nice extras like miso soup, and they make up a bit for the atmosphere by playing nice classical music.
Finally, the price is very reasonable and you get good portions!