In the end, the marriage which started in 1996 could not be broken. In fact, neither party opened the door to any other suitor.
Japan coach Jamie Joseph said his side's thrilling, speedy brand of rugby is down to their intensive preparation and their trust in the gameplan.
Japan produced a scintillating display of attacking rugby to beat Scotland 28-21 and reach the quarter-finals for the first time, lifting the nation still reeling from the deadly impact of Typhoon Hagibis.
Scotland's crucial clash against Japan will go ahead, while Canada and Namibia's Rugby World Cup dreams are over.
Ireland played with 14 men for 50 minutes but still eased into the Rugby World Cup quarter-finals with a seven-try demolition of ragged Samoa.
Scottish Rugby Union chief Mark Dodson said he's ready to launch a legal challenge to prevent World Cup organisers cancelling his country's game against Japan - a measure that would almost certainly eliminate the Scots.
In its own way, World Rugby has combined complete nonsense, ground-breaking technology and blatant doctoring at its marquee tournament in Japan, ODT sports editor Steve Hepburn writes.
Australia made heavy work of it in difficult conditions but outlasted a tough Georgia team to round out their Rugby World Cup Pool D campaign with an unconvincing 27-8 victory.
World Rugby has refuted reports that the All Blacks turned down the chance to play their final Rugby World Cup pool match against Italy on Monday.
The All Blacks could still have played their final Rugby World Cup pool game against Italy, but turned it down, according to a report.
Italy captain Sergio Parisse says their World Cup match wouldn't have been cancelled if the All Blacks had needed to win to make the quarter-finals.
George Horne scored a hat-trick as Scotland ran in nine tries in a 61-0 bonus-point thrashing of Russia on Wednesday.
Winger Josh Adams grabbed a hat-trick of tries as Wales battled to a 29-17 bonus-point win over Fiji last night.
Argentina ended a disappointing World Cup campaign on a high as they ran in seven tries to hammer the United States.
The All Blacks are monitoring reports of a typhoon approaching Japan which could affect their travel to Nagoya on Friday.