Most places in Japan won’t let you have any animals. I guess this is why this iPhone/iPad cat app makes sense. Honestly, if I wanted another cat, I’d just go out and catch one of those stray kittens, even if my place doesn’t allow any animals (it doesn’t, and we’ve got a cat and a dog anyway).
The virtual cat reacts to your touch and movement. You can pet it, virtually of course! There’s even an augmented reality function that allows you to project the cat on your current background, via the camera. You could pretend that the cat is on your bed.