Niwana isn't your standard Japanese or Korean food restaurant. It's hidden on 33rd Street in Charles Village, so it rarely sees a packed house; during the academic year, however, it gets plenty of repeat customers from nearby Hopkins students.
In addition to a sushi bar and full-service bar, they've got some wonderful lunch and dinner specials. Try one of their "bento boxes"- you'll get an entrée, tempura, a California roll, salad, soup, and fresh fruit. At less than $10, that's a steal for a very filling lunch! I also suggest the bul goki- SO good!