This is something I never notice before but it must have been around for a long time, Auto Fried Rice Machine.
But there it is!
It looks like, on the bottom is a burner that 'fires' the rice. And as that is burning away the drum is spinning like a cement truck and flipping the rice around. The rice was falling in like waves, similar to someone flipping it in a wok.
The dish looks and tastes really good!
The fried rice dish was 920 yen or about $6.10 The actual dish look almost exactly like the menu photo.