Crown Prince Akihito is formally installed as Emperor Akihito of Japan, becoming the 125th Japanese monarch.

A crown prince or hereditary prince is the heir apparent to the throne in a royal or imperial monarchy. The female form of the title, crown princess, is held by a woman who is heir apparent or is married to the heir apparent.

Akihito is a member of the Imperial House of Japan who reigned as the 125th Emperor of Japan from 7 January 1989 until his abdication on 30 April 2019. The era of his rule was named the Heisei era, Heisei being an expression of achieving peace worldwide.