Why is there the tomb of Yang Guifei in Japan?

Japan has the tomb of Yang Guifei because:

In history, Yang Guifei was hanged on Maweipo. The tomb of the imperial concubine He Lai in Japan has always been a mystery. However, Japanese scholar Ryuice Watanabe verified in the article The Secret History of Yang Guifei's Resurrection that after Yang Guifei escaped from Maweipo, she was helped by dancers and musicians in the Tang Dynasty and moved to Yangzhou.

There, she not only met the eldest grandson's concubine's brother Yang and her youngest son, but also met the Japanese envoy to the Tang Dynasty. With Fujiwara's help, Yang Guifei landed in Kudo, Japan in 757 AD on a Japanese mission ship.

After arriving in Japan, Yang Guifei was warmly received by Kejsarinnan Koken. Later, with her intelligence, Yang Guifei helped Xiao Qian defeat a palace coup. Since then, she has gained great fame in Japan and won the love of Japanese people, especially Japanese women. So Japan has the tomb of Yang Guifei.

The structure of Yang Guifei's tomb in Japan;

There is a small cemetery in Erzun Garden, Oil Valley Town, Otsu County, Yamaguchi Prefecture, Japan. Located in front of the cemetery, near the sea is the cemetery of overseas Chinese Yang Guifei, which is a platform made of rubble of more than ten square meters. There are five stone pagodas on the stage, which are called five-wheel pagodas by the Japanese and listed as national protected cultural relics.

There are no large-scale temples, tombstones and other obvious signs here, only a few flowers inserted in front of the tomb prove that people are constantly coming to visit the grave. There are two relatively new wooden boards in front of the tomb, one is about the introduction of Yang Guifei's tomb, and the other is about the Five Wheels Tower.