Small sideskirts are probably to help prevent air from curling under the car. The car has a flat bottom.
The air intake feeds functional ducts. Probably for heat exchangers to cool the motor or batteries or inverter.
The rest of the stuff at the Nissan Crossing was not that interesting so I didn’t bother taking pictures of it. I think this showroom display gives Nissan many positive impressions from a high-end clientele that visits Ginza.
A lot of people suggested looking at the Ginza Porshe display but to me, it was a small, less than run of the mill Porsche dealer. They had Macans and Cayenne’s on display and one lonely Cayman. No trick GT cars or Turbos. They did have a nice cafe/restaurant.
For a taste of Japanese culture, Ginza is also home to the national kabuki theater. It is world-renowned. I don’t care about that stuff so a picture of the outside is all you get!