The encounter took place outside the Millennium Stadium.
The meeting took place outside the Millennium Stadium before Wales' World Cup match against Uruguay at the weekend, the BBC reported.
BBC Scrum V
In the clip the excited fan exclaims that Williams is very famous in Japan and asks the 38-year-old to sign his shirt and pose for two photos.
BBC Scrum V
Williams, who scored 58 tries in 87 Tests for Wales, finished his career playing in Japan with the Mitsubishi Dynaboars.
BBC Scrum V
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