Japan's MeToo icon is up for an Oscar - but the film can't air in the country

When Japanese journalist Shiori Ito decided to speak up about her rape allegations, she knew she was standing in the face of a society that preferred silence.

"I'm scared…but all I want to do is to talk about the truth", Shiori says in the opening scene of her Oscar-nominated documentary Black Box Diaries.

Shiori became the face of Japan's MeToo movement after she accused a prominent journalist Noriyuki Yamaguchi of rape.

Her acclaimed directorial debut, based on her memoir of the same name, is a retelling of her quest for justice after authorities found the evidence insufficient to pursue criminal charges.

But there is one country where it is yet to play: Japan, where it has run into huge controversy. Her former lawyers have accused her of including audio and video footage she did not have permission to use, which, they say, has violated trust and put her sources at risk. Shiori defends what she did as necessary for "public good".

It's a startling turn in a story that gripped Japan when it first broke -the then 28-year-old Shiori ignored her family's request to remain silent. And after her public accusation did not result in a criminal case, she filed a civil lawsuit against Yamaguchi and won $30,000 (£22,917) in damages.

Shiori told the BBC making the film involved "reliving her trauma": "It took me four years [to make the film] because emotionally I was struggling."

She was an intern at Reuters news agency in 2015, when she says Yamaguchi invited her to discuss a job opportunity. He was the Washington bureau chief for a major Japanese media firm, Tokyo Broadcasting System.

Shiori claims she was raped following a dinner in Tokyo with Yamaguchi, who has always denied the allegations.

CCTV footage of an intoxicated Shiori being dragged from a taxi and into a hotel is part of the more than 400 hours of footage she edited for the documentary.

he editing process, she says, was "really challenging. It was like hardcore exposure therapy."

When the film was released, the CCTV footage became a source of friction as Shiori's team of ex-lawyers, who helped her win her lawsuit, slammed the documentary.

They claimed it was unauthorised use of CCTV footage - and that she had violated a pledge not to use it outside of court proceedings. .

Last week, her former lawyers – led by Yoko Nishihiro - held another press conference, saying her use of the footage posed challenges for other sexual assault cases.

"If the fact that the evidence from the trial has been made public is known, we will be unable to obtain cooperation in future cases," Ms Nishihiro said.

Ms Nishihiro claimed that Shiori had also used unauthorised recordings, saying she only found this out at a screening of the film last July.

This included audio of a police detective who eventually acted as a whistleblower about the investigation process – as well as a video of a taxi driver who provided testimony about the night of the alleged rape. Both of them, the lawyers argued, were identifiable and neither had given their consent to be featured in the film.

"I've been trying so hard to protect her for eight-and-half years, and I feel like I've been completely torn apart," Ms Nishihiro said.