all this sushi for only 320 calories?

is all of this sushi really only 320 calories? i already ate some and the nutrition label is torn but there was 5 pieces in each row. it says 1 serving per container and serving size = 1 so I double checked it should be 320 cals for the whole thing. i’m just skeptical bc that seems like a pretty good amount of sushi for 320 cals in general plus all the sauce and toppings