Nara Japanese Restaurant  is just opposite Epping train station on the western side of the railway line. It is spacious and therefore often seems a little empty but I have always found the food to be fresh and delicious. I have been a few times and these photos are from June last year (yes still catching up).
Epping is not exactly buzzing with nightlife, but has a variety of Italian, Thai, Vietnamese and Chinese restaurants so there is obviously a market there.  I’m not sure if people prefer the sushi bar down the road at the top of the Epping Arcade or if it just seems busier as it is so tiny (gateway to lolly shop heaven- Lollyworld, 6 Epping Club Walkway, 49-52 Beecroft Rd, Epping). Tokyo Sushi Bar is certainly in a better location for passing customers who pass right by it after coming down the stairs from the station and the service is more intimate with a family feel.
All that said, if you have a big group then you will fit easily at Nara, and there is even a private room which looks fun. Anyway, here is the food for you to see for yourself:

Sushi plate, with yakiniku beef in the background

Tempura prawn, salmon and vegetables with a light dipping sauce

37 Beecroft Rd Epping NSW 2121

Phone (02) 9868 6815