The country may shortly witness either its first female or youngest-ever head of government as the country's governing faction selects its second new leader in just over twelve months.
The Liberal Democratic Party is looking to succeed Prime Minister Shigeru Ishiba, who stepped down recently after his government failed to maintain control in both houses of parliament.
The chosen leader will face numerous challenges - not least leading a party still struggling to regain public confidence after major financial corruption scandals.
Additionally, they must to balance the complicated American-Japanese ties while implementing the tariff deal negotiated under the previous administration with the former US leadership.
A planned meeting from the former US president to Japan in late October comes as both nations - long-standing partners significant collaborators in trade and security issues - continue to hash out methods to execute the deal over tariffs.
Domestically, the incoming leadership must additionally find a way to enhance the flailing economy while addressing growing price increases and a persistent cost-of-living crisis, in addition to addressing a shift toward the far-right.
Securing the position of prime minister for whoever wins cannot be assumed since the ruling party no longer holds an absolute majority within the legislature.
The upcoming election will occur among the party's legislative members along with local supporters.
Should no candidate secure a majority during the first round, a runoff will quickly follow among the leading contenders.
Three names have been floated as potential successors: the agriculture minister, the chief cabinet secretary, along with a veteran politician, potentially becoming the nation's inaugural woman leader if she won.
Takaichi, in her mid-sixties, has long respected of Margaret Thatcher's leadership.
Known as a strong supporter and follower of the late PM Shinzo Abe, she is a hardline conservative, is known to oppose marriage equality while frequently attending the controversial Yasukuni Shrine.
Previously not considered an active supporter regarding gender equality, however her position has shifted recently, pledging to make babysitter fees eligible for tax benefits and proposing business incentives for companies offering in-house child care services.
The candidate committed to double the size of the economy within ten years with heavy state investment for innovative developments, public works, agricultural sectors along with additional fields of economic security.
Koizumi, 44, is the son of his political father, the former leader from 2001 to 2006.
Considered the young fresh-face of the mostly older LDP, the candidate is media-friendly active on digital platforms, where he is known for sharing feline images.
His popularity increased recently as agriculture minister after reducing costs for staple foods while receiving acclaim by veteran LDP colleagues for his leadership regarding agricultural matters.
Similar to competitors, Koizumi has vowed to trim taxes assisting families cope with rising living costs.
The third frontrunner the chief cabinet secretary, serving as the government's top spokesperson.
Analysts note he represents not so flamboyant, yet seasoned and proven.
His backing comes hail from a faction once led by the ex-leader.
Additional candidates that have been floated include the ex-diplomatic chief Toshimitsu Motegi and former economic security minister from the party ranks.
The leadership battle follows a bruising few years for the ruling faction including a "cascade" of scandals, public disengagement historically poor polling numbers.
Earlier this year, the incoming leader called early voting for October, saying it was "important for the new administration to be judged by the people promptly.
This strategic move which proved unsuccessful.
The electorate - still furious over the corruption scandal coping with price increases and a cost-of-living crisis - returned the party's worst result in a decade.
For the first time since 2009, the LDP - governing the nation almost continuously for decades - failed to maintain legislative control.
Then this year, it lost its majority in the upper house parliamentary elections.
The leader initially declined requests for resignation initially, saying he needed to take responsibility for electoral setbacks and to deal with a trade deal with Washington.
But in early September - ahead of an internal leadership vote that would've likely voted him out - he resigned, stepping down preparing for today's vote.
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Colin Mills
Colin Mills