I don't know where you'll be coming from. But - depending on your point of origin and how you deal with time zone changes - the jet lag to Japan can be formidable. For example - I live on the east coast of the United States. For the first 5 days I was in Tokyo - breakfast felt like lunch - lunch felt like dinner - and I was sound asleep by 7:30 pm.
The good news is that many higher end restaurants have lunch menus that are considerably cheaper than dinner menus. We'll be returning to Tokyo in the fall - and I plan to make mostly lunch reservations. Robyn