Eddie Jones was named by Japan as their new head coach on Wednesday, six weeks after the Australian quit the Wallabies following their exit at the Rugby World Cup.
Jones previously coached Japan for three years from 2012 and led them to their historic win over South Africa at the 2015 World Cup.
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Speculation was rife that he would return after Australian media reported that he had interviewed for the job during the Wallabies' World Cup campaign in France.
The pugnacious 63-year-old repeatedly denied being linked with the job.
Jones quit the Wallabies after just two wins from nine Tests since taking over in January, including a worst-ever World Cup performance where they failed to make it out of the pool phase.
He was appointed Japan coach ahead of South African Frans Ludeke, who led Kubota Spears to last season's Japanese club title.
He will officially take over on January 1.
Jones, whose mother is Japanese-American, has maintained links with the country since leaving the Japan job in 2015.
He continued to work as a consultant to club side Tokyo Sungoliath while coaching England, making regular visits.
Jones led Japan to unprecedented success in his previous spell in charge of the Brave Blossoms.
They stunned South Africa 34-32 at the 2015 World Cup in a match that became known as the "Miracle of Brighton".
That was only Japan's second win at a World Cup, and they also went on to beat Samoa and the USA that year before exiting at the pool stage.
Jones's successor Jamie Joseph built on that foundation, taking Japan to the 2019 World Cup quarter-finals on home soil.
Joseph announced before this year's World Cup that he would step down after the tournament.
Japan failed to make it past the pool stage after losing to Argentina in their final game in France.
