Seryna is a Tokyo Shabu Shabu chain. This location is on the 52nd floor of the Sumitomo tower, which is about half a mile from the Shinjuku train station.
Kobe Beef Kaiseki 511 was one of the restaurants on my must try before leaving Japan or don't leave Japan at all. It's in an alley way and the decor is very modern and contemporary.
Imafuku is located in an odd spot in Minato, Tokyo. It's right next to a bunch of different apartment complex and an oddly quiet area for a sukiyaki spot.