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In the past twenty years, Japan has seen more than 10 leaders.

Actually, one expert likens assuming the country's highest office to drinking from a "cursed cup".

However, what is the reason does Japan keep changing prime ministers? This is partly because of it being a "one-party democracy", explains Professor James Brown of Temple University Japan.

The Liberal Democratic Party's control on the country's politics means the primary rivalry originates within the party, instead of from opposition groups.

"Therefore inside the LDP there are vicious struggles within various groups - they all desire their own faction to secure the leadership position."

"Thus although you could be selected as prime minister, the moment you're in power, you have many individuals manoeuvring to try to remove you again."

Main Reasons Behind Rapid Turnover

• One-party dominance limits outside challenges
• Internal factional rivalries drive power struggles
• The prime minister's position is frequently called a "cursed position"
• Political stability remains elusive despite economic strength