When Shiori Ito alleged at a 2017 news conference that Noriyuki Yamaguchi, a prominent TV journalist and friend of Japan’s then-Prime Minister Shinzo Abe, had two years earlier drugged and raped her in a Tokyo Sheraton hotel, she hoped the revelation would spark media interest in her case. But instead, the young journalist was subjected to online trolling and so many threats that she vacated her apartment, eventually retreating to London. There, in the company of Hanna Aqvilin, a Swedish producer-director she’d met only via Skype, Ito’s determination resurfaced. “I started feeling like maybe I needed to do something, my own investigation as a journalist but also as a survivor,” she says while sitting in a cushioned alcove at the Four Seasons Hotel. “People in London said, ‘I want to make your documentary.’ And I didn’t want them to. I wanted to tell my own story.’” She wrote a memoir about the trauma, which some credit with starting Japan’s #MeToo movement, and worked on her documentary, pursuing legal cases against Yamaguchi for much of that intervening period. In “Black Box Diaries,” Ito uses everything she