On the right side of the walk course from JR Shin-Nihonbashi Station to Kodemmacho Subway Station.
There is a shop of "Sukiyaki Iseshige".
In front of the shop, there was a lunch guide. "Meiji's fragrant sukiyaki" seems good.
Take-out lunch boxes are easy and offered at reasonable prices.
Please refer to the following URL for details.
http://www.chuo-kanko.or.jp/search/index.php/show/shop/1-25?t=1296256162