Koyomi is an Asian style restaurant located on Castro Valley Boulevard. The location offers a wide range of authentic Japanese dishes, including sushi, salads, soups, tempura, sashimi, noodles, seafood and fish. Some menu options include seaweed salad, sashimi appetizer, shrimp tempura, pork miso ramen, miso soup, rainbow roll, cucumber salad, spicy scallop, tofu, salmon, spicy tuna hand rolls and more.