Katsusando from Fresh Bakery in Akasaka. Katsu is deep fried pork with a special sauce. Usually, it is served over rice witha side of shredded cabbage. That is called Tonkatsu and it is a very popular Japanese dish. Put it between two slabs of soft white bread and you have a Katsu-Sando or Katsu Sandwich. Yum yum yum. It's pretty hard to get a bad katsusando since there are so few ingredients so it makes for a safe meal.
Fresh Bakery is in the Akasaka Sacas building in front of the Chiyoda line ticket machines.