In the past twenty years, Japan has had more than 10 leaders.
In fact, one expert compares assuming the country's top job to taking a "cursed cup".
But why does Japan frequently replace prime ministers? This is partly because of it being a "single-party system", says Professor James Brown of Temple University Japan.
The Liberal Democratic Party's control on the political landscape means the primary rivalry originates within the party, instead of from opposition groups.
"Therefore inside the LDP there are intense conflicts within various groups - they all desire their own clique to get the top job."
"So even though you might be selected as prime minister, the moment you're in power, you have dozens of people manoeuvring to try to remove you again."
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