Pepsi J-Cola Zero (Japan & Joy Cola)
I think the "J" stands for Japan or Joy. Or both. That's what one side of the can reads: Japan & Joy Cola.
I had this in Nagoya one day on my trip. No Coke Lite that's for sure. Nice can, though. If my Dad was still in the business of collecting bottles and cans, I might think about bringing one of these home for him. Alas, he isn't. So, I didn't.