Rice will be harvested in Tokyo's Roppongi entertainment district this fall.

And 40 meters above ground at that, from a 130-sq.-meter paddy on top of the Keyakizaka Complex at Roppongi Hills, which opened last month. On Children's Day, May 5, two kinds of rice were planted there, to be organically grown using rain water from a pond that's up there, too.

If all goes well, the rooftop harvest will be around 60 kg -- though Mori Building Co., the developer of Roppongi Hills, has yet to decide who will finally get to eat the grains.