This tale is doubly unlikely but in opposition. We have now an extensive and plausible narrative of Jesus and the white brotherhood in particular. All that makes his presence in different parts of the world both plausible and certainly possible. That includes going to the South East USA as the great circle route remained intact. Thus a trip to China is also possible.
For Japan, this sounds like a disciple arrived with a companion as the bare minimum understanding.. Again the Jesus movement consciously sent disciples out to all corners of the Earth to actually secure the movement. It success was always pastoral and this allowed the movement to expand almost out of sight, but typically with local political support.
After all, a movement that stops the promotion of armed rebellion is terribly helpful..
A Surprising Japanese Interpretation of the Lost Years of Jesus Christ
A copy of the document on display in the village of Shingo. ( Check Your Facts )
The Legendary Tomb
"Tomb of Christ" (Shingo, Aomori, Japan). ( thor hestnes/CC BY 3.0 )
''When Jesus Christ was 21 years old, he came to Japan and pursued knowledge of divinity for 12 years. He went back to Judea at age 33 and engaged in his mission. However, at that time, people in Judea would not accept Christ's preaching. Instead, they arrested him and tried to crucify him on a cross. His younger brother, Isukiri casually took Christ's place and ended his life on the cross.
Christ, who escaped the crucifixion, went through the ups and downs of travel, and again came to Japan. He settled right here in what is now called Herai Village, and died at the age of 106. On this holy ground, there is dedicated a burial mound on the right to deify Christ, and a grave on the left to deify Isukiri.''
Sign explaining the grave of Christ in Shingo, Aomori, Japan. ( Public Domain )
Another Version of the Story
Who was Jesus in Japan?
Christian Martyrs of Nagasaki Japan. (c. 17th century) ( Public Domain )