Sanae Takaichi, of the most conservative faction of Japan's Liberal Democratic Party (LDP), may become the country's first female prime minister.
Takaichi lacks diplomatic experience and is faced with numerous challenges, including an ailing economy, Sino-US tensions, and a burgeoning alliance between Russia and North Korea.
Takaichi, a staunch nationalist, threatens to tighten conditions for foreigners despite Japan's demographic decline.
A strong supporter of Taiwan, Takaichi seeks to strengthen economic relations between Japan and Taiwan.
The Trump administration is likely to support her wish to drastically increase the defense budget.
Takaichi's election has been met with defiance from China and little reaction from South Korea.
Conclusion: If Takaichi does not soften her nationalist and ideological stances, Japan risks isolation that could further weaken its economy and security, and heighten regional instability.