. "I think our campaign has put pressure on North Korea."

Has the boycott worked?

Lee Young Hwa, a professor at Kansai University who is an expert on the North Korean economy, said the effort has had some effect.

"You used to see advertisements in the media and on the streets pitching stores selling North Korean-made suits for 10,000 yen. You don't see the ads, nor the suits, as much as you used to," he said. "More and more Japanese will no longer buy goods they know are North Korean, even if those goods are extremely cheap."