Fuji Heavy Industries, which makes Subaru-branded cars, is another prime beneficiary. The automaker's stock is up 73% so far this year.
Why? Most of the rise can be attributed to the weaker yen.
Weak currency cheapens the price of a country's exports, making them more attractive to international buyers by undercutting competitors.
As a result, even the smallest move in the yen has a big impact on Japan's exporters.
In February, Fuji Heavy raised its sales outlook for the year. The company cited the yen's decline as the reason for the revision.
Japanese Finance Minister Taro Aso has defended his country's fight against deflation, saying the yen's decline is an unintended consequence.