May 22, 2017
I was at the subway station of Omotesando the other day, and they got a little food court. There, I discovered a new system that I've never seen elsewhere in Japan.
Since it is a food court, solo-eaters might leave the seat once in a while to get more food/services. To avoid your plates being taken away, you can leave this card on the table facing up.
On the other hand, the red side notifies the staff to clear the table for you and that you're done.
And this means that at this food court, cleaning after yourself is totally not necessary.
I've seen the card system used at all-you-can-eat/drink places, but this is my first time to see it applied to a food court.