The nation set to choose woman prime minister in landmark first
Over the last two decades, the country has seen more than 10 prime ministers.
In fact, a specialist likens assuming the country's top job to drinking from a "cursed cup".
However, what is the reason does the country keep changing leaders? This is partly because of it being a "single-party system", says Prof James Brown of Temple University in Japan.
The LDP's grip on the country's politics means the primary rivalry originates within the party, instead of from opposition groups.
"So within the LDP there are intense conflicts within various groups - they all want their own clique to secure the top job."
"So even though you might be selected as prime minister, as soon as you're in office, you have dozens of people scheming to try to get you out again."
Key Factors Behind Rapid Turnover
- Single-party rule restricts external competition
- Party infighting drive leadership contests
- The prime minister's position is often described as a "poisoned chalice"
- Political stability remains elusive despite economic strength
