Katsunori Tanaka spent most of his 19 years at Goldman Sachs Group scrutinizing Japan¡¯s biggest banks as an equity analyst. Now he¡¯s making money obsessing over much smaller lenders at his ?48 billion ($320 million) hedge fund Ariake Capital.

Tanaka¡¯s switch centers on investing in banks whose businesses barely extend beyond the Japanese countryside ¡ª lenders that until recently were dismissed as the embodiment of the country¡¯s decades of stagnation and deflation. Now, with prices and interest rates trending higher for the first time in a generation, things are finally looking up for the sector, even as economic prospects in many rural areas remain uncertain.

It¡¯s been a success so far, with the fund returning more than 300% in roughly three years since its inception. Ariake recently raised money from family offices in the United States, underscoring how global investors¡¯ renewed interest in Japan has extended to money managers who can generate returns beyond the obvious targets.