Is the Japanese Emperor a descendant of Xu Fu in Qin Dynasty?

Xu Fudong did inject a lot of Qin blood into Japan, but it is problematic to pay attention to the genealogy of the Japanese emperor.

The genealogy of emperors compiled by the so-called Shoto Kutaishi contains at least 10 fictional "emperors".

And before the emperor, Japan also experienced chaotic battles.

So when the winner finally stood out and won the crown, it was hard to say whether he was a descendant of Xu Fu or a teenager or craftsman who accompanied him.