Stephen Nomura Schible refrains from saying whether he and musician Ryuichi Sakamoto are friends, or even close, despite having filmed a documentary about him.

"When I'm in the U.S., everyone refers to him by his first name, but in my mind and when I'm in Japan, he is always Sakamoto-san," says Schible. "It's not my place to call him otherwise. I have too much respect for him."

Sakamoto apparently returns the compliment.