Japan on course to elect female prime minister in landmark first

Over the last two decades, the country has seen more than 10 prime ministers.

In fact, a specialist compares taking up the nation's top job to taking a "poisoned chalice".

However, what is the reason does Japan frequently replace leaders? It's due in part of it being a "one-party democracy", explains Prof James Brown of Temple University Japan.

The LDP's grip on the political landscape means the main political competition originates within the party, instead of from external parties.

"So within the LDP there are vicious struggles within different factions - they all desire their own faction to get the top job."

"So even though you could be selected as leader, the moment you're in office, you have many individuals manoeuvring to try to remove you again."

Key Factors Behind Rapid Turnover

• One-party dominance limits external competition
• Party infighting fuel leadership contests
• The leadership role is frequently called a "poisoned chalice"
• Political stability remains elusive despite financial power