Tonjiru - pork miso soup - is the main dish here and it's very tasty soup indeed. Packed with tofu and fresh vegetables (carrots, daikon, onions and leeks), it's got a pleasantly creamy consistency and wonderful depth of flavor. Soups start at Y640 a la carte or Y890 for a teishoku (soup plus rice, pickles and a small salad), and you can add in ingredients like egg, natto, pork spareribs and keema curry, or upgrade to fancier types of miso.
The shop is run by Camp Curry, the popular campsite-themed vegetable-curry chain, and they use premium-grade vegetables similar to those in their curries. While this branch is notably lacking in atmosphere, at least service is fast and efficient, and you can get everything to go.