Japan head coach Eddie Jones said frustrations with the country's rugby direction is the reason for his departure from his position after the Rugby World Cup.
The former Wallabies boss revealed he was unhappy with Japan's rugby administrators.
"I’ve found myself questioning the ambition of the people running the sport there," he told The Independent.
"It’s very disappointing."
Jones, who guided Japan to a shock 34-32 victory over the Springboks in their World Cup opener in Brighton on Saturday, is heading to Cape Town to take over as the Stormers' new coach.
He said the progress at Japan's Super Rugby franchise has left him deeply frustrated.
"I worked pretty hard to make the Super Rugby thing happen, but it doesn’t look like working out," added Jones.
"There are a lot of issues in Japanese rugby at the moment and I don’t feel things are moving forward in the right way.
"I’ve spent four years in this job and it’s been hard work. When you’ve helped develop the national team to its present level, you want to know that you can move to the next stage and keep getting better.
"I’m not confident that we’re quite in that position."