The rapid drop in the yen helped lure a record 3.17 million tourists to Japan from January to April, but achieving the government's goal of 10 million this year will require more work, Japan Tourism Agency Commissioner Norifumi Ide said.

The first quarter was a good sign, but "if the momentum remains at this level, we will miss the 10 million goal by an inch, so we have to take some more measures," Ide said in an interview with The Japan Times last week.

Japan saw increased momentum last month, too. The Japan National Tourism Organization said Wednesday that 875,000 visited Japan, a 31.2 percent increase compared with May 2012 and the third-largest figure ever for the monthly count.