Japan triumphed 28-21 against Scotland to reach the quarter-finals for the first time and drew more than half the Japanese population to watch the match on terrestrial TV.
The average audience share for the NTV broadcast was 39.2%, but at 9.41pm – as the game reached its conclusion – it was 53.7%.
That means around 60m people were watching the match at its peak.
This record will likely not stand long with the Brave Blossoms facing South Africa in the Rugby World Cup quarter-finals this weekend.
Meanwhile, in the UK, the final pool match drew 4.1m viewers, giving ITV a 41% audience share.
At one point 5.7m people were tuned in to the ITV broadcast!
WOW! 🙌
Viewing figures for Japan v Scotland peaked at 53.7% of the Japanese population, averaging at 39.2% - meaning over 60 million were watching at its peak.
Domestic TV audience has now more than doubled since the opening game against Russia.
#RWC2019