Japan's Emperor Naruhito will officially take the throne on Tuesday in a lavish ceremony.
The head of state, 59, has officially started his reign in May rituals.
His rise comes when Japan is still struck by the aftermath of the typhoon Hagibis, which killed nearly 80 people.
A parade celebration was postponed out of respect for the victims and their families.
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More than half a million people convicted of minor crimes are pardoned to celebrate the enthronement.
What will the enthronement ceremony look like? Sokui no Rei ̵
1; or the accession ceremony – will begin on Tuesday at 13:00 (04:00 GMT).
Emperor Naruhito will climb the 6.5m high Takamikura throne while dressed in a yellow and orange robe that according to Kyodo is worn only by emperors on special occasions.
His wife, Empress Masako, will sit on a neighboring throne.
The ceremony will take place in the presence of an ancient sword and jewels – sacred treasures that act as a symbol of imperial power.
The 30-minute ceremony ends with a speech by the Emperor, followed by a congratulatory speech by Prime Minister Shinzo Abe.
Dignitaries from more than 170 countries, including the British Prince Charles, will be present.
The Emperor will later host a tea party for foreign kings, while Mr. Abe will hold a banquet in the evening.
An installment of the throne, in which the emperor drives in an open car to "hit" the public, was postponed to November 10.
How big is the business?
A pretty big deal. The last time an enthronement ceremony took place in 1990, when the then Emperor Akihito officially ascended the throne.
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Former Emperor Akihito, the father of Naruhito, gave up the throne in April this year and became the first monarch to do so for more than 200 years.
He received the special permit to resign after being unable to fulfill his role due to declining health.
The Emperor's role is largely ceremonial and focused on public engagement for citizens and meeting with foreign dignitaries.
Did Naruhito not already conquer the throne?
Emperor Naruhito officially began his reign on May 1st.
According to a Japan Times news site, the ceremonies held that day were "easier and meant to be the immediate heir to the throne".
The Sokui no rei will be a big event more elaborate.
It is not uncommon for there to be a gap between the first line of succession and the Sokui no rei .
For Emperor Akihito, there was a gap of almost two years between his succession to the throne and the Sokui no rei.
According to a Japanese expert, the reason for the confusion this time is that the abdication of the then Emperor Akihito broke off the normal process.
As a rule, it only comes to absences when a king is dead. The solemn enthronement can only take place after at least one year of mourning.
"Normally one proceeds in such a way that one emperor dies and then of course immediately sets up the next emperor, but in this case it seems much more normal that the main ceremony [ascension] takes place afterwards, because [the country]] still mourns" said Ken Ruoff, author of the Japanese Imperial House in the post-war period.
But because the then Emperor Akihito had resigned, the rise of Emperor Naruhito was considered much more of a festival.
"The world just assumed that this was the common festival, but the real celebration is what's happening now," said the BBC's Ruoff.
"Add to that the international representatives, and there will be incredibly elaborate banquets." instead of. There should also be a parade. It is not perceived as a big deal. [to] The rest of the world asks, "Have not we already done that?" But it is a big deal for the Japanese. "