The nation set to choose woman prime minister in landmark first
Over the last two decades, the country has had more than 10 prime ministers.
In fact, a specialist likens taking up the nation's top job to drinking from a "cursed cup".
However, what is the reason does Japan frequently replace leaders? This is partly because of it being a "single-party system", says Professor James Brown of Temple University Japan.
The LDP's grip on the country's politics means the primary rivalry originates within the party, instead of from external parties.
"Therefore inside the LDP there are vicious struggles within different factions - they all desire their own clique to get the leadership position."
"Thus although you could be chosen as prime minister, as soon as you're in power, you have many individuals scheming to try to get you out again."
Key Factors Behind Rapid Turnover
- One-party dominance limits outside challenges
- Internal factional rivalries drive power struggles
- The leadership role is often described as a "poisoned chalice"
- Government continuity remains elusive despite financial power
