Sometimes you have to improvise and make due with what is available in the house (when you did not have time to go out and shop). Below is a dead simple meal that is pretty low in calorie but pretty good nutrition. It's not traditional Japanese; it's a kind of fusion I guess.

Steamed, Carrots and crunchy Endo mame (beans) with sesami dressing
Fried rice (white a some brown) with kimchee and a little lean hamburger meat seasoned with a kind of yakiniku BBQ sauce
Lettuce (to wrap the fried rice; you can then eat the rice like a sandwich)
Egg soup with a chicken stock
Ice tea (no sugar)