We were invited to lunch at Hotaru Japanese Cuisine on Powell between Washington and Clay. (not related to Hotaru in San Mateo) We ordered the tuna special (a belly-cut grilled to perfection), teriyaki chicken (moist and tender), and seafood udon (a generous portion served in a traditional cast-iron bowl) and grilled smelt. The food was standard Japanese fare but since everyone in our party has dietary needs, we were delighted that the chef was very accomodating in preparing our food with low salt and low fat -- yet everything was delicious.
There is a large selection of fresh fish, including tuna, swordfish, bass and scallops. They have an off-menu dish, Gintara kasuzuke that was highly recommended. California roll sushi, was included with our specials and the menu has a full selection of many types of sushi.
Service is attentive and the waitress was particularly knowledgeable about nutritional benefits of ingredients.
There is a parking garage a block away, across from the Chinatown library.