I've been personally involved with Rikki Rikki for many years and the owners are some of the nicest and decent people you'd meet. The food is always fresh and Masahiro (the owner) comes up with new interesting recipes and dishes all the time. His experimentation with sauces and marinades led to a whole side business (www.rikkirikki.com). The interior of the restaurant is simple, yet very unique and modern, utilizing anime-style drawings on the walls. There are several private booths in the back. The staff is always friendly and helpful.
More information can be found on their web site (www.rikkirikki.com). In addition to information, the site provides ability to order takeout online (via www.takeout-online.com) as well as order their excessively tasty dressings, sauces and marinades (Soy Ginger is most popular, although Asian Ranch with Wasabi is my favorite).
If you're looking for sushi, bento boxes, environment with good food and service - check out Rikki Rikki.