In the Oak Hall of the Japanese Emperor Tenno

The Three Sacred Treasures (三種の神器 Sanshu no Jingi/Mikusa no Kamudakara) are the imperial regalia of Japan part2

No one outside the imperial elite has seen the three treasures of Japan needed by an emperor to claim the throne.
I finally have it unboxing :-)

The new Japanese Emperor Naruhito wished for peace and happiness for Japan and the world in his speech. his wishes should come true