Yes, I'm talking about the Japanese hamburger restaurant chain. Their chicken teriyaki burger is pretty awesome and should be experienced at least once in between all the sashimi you'll get in Tokyo anyway. Besides, unlike the western equivalents, their portions are nicely snack-sized for most western folks.
Curiosity: IF you happen to go there hungry and in a company, be aware that the clerks probably won't believe you if you order more than three burgers at once. Happened to us on all three times we went:)