Teen's death exposes Japan's 'hostage justice' system as family sues state

In June of last year, a mother in Japan's Hyogo region received a phone call that would reshape the rest of her life. Police were taking her sixteen-year-old daughter into custody. Nami rushed to the station, told them she would be there in half an hour, and asked them to wait. By the time she arrived, her daughter was gone.

Runa had been accused of assaulting a client at the disability care centre where she worked—a place her own mother ran. The girl maintained she had only pressed her hand gently against the person's chin to prevent them from biting and pinching others. Nami brought evidence to the police station: photographs, witness statements. She pleaded with officers to release her daughter, or at the very least to let her see her. None of it mattered. For eighteen days, Runa remained in a police cell. Her mother was not allowed to visit.

What happened in that cell, Runa recorded in a notebook her lawyer had given her—the only place a suspect in Japan can document their interrogation, since defence lawyers are barred from sitting in on police interviews. "I'm so shocked I can't eat, even though I haven't done anything," she wrote. "Can things really turn out like this when I haven't done anything?" Between fragments of her interrogations, she wrote to her mother: "Mum, I want to see you. I'm sorry. Thank you for everything. I want to eat with you. I want to sleep with you. I want to go shopping too. I want to hug you." During those interviews, according to her lawyer's account, she was pressured repeatedly. "Do you want to go to a juvenile detention centre? How long are you going to keep this up?" officers allegedly asked. "It's not like I'm trying to take down your mother's business. Don't cause your mum any trouble."

Runa barely ate. At one point she collapsed and was taken to hospital, but even then her mother was not permitted to see her. She was returned to custody. When she was finally released after eighteen days, the case against her was dropped. She had been innocent all along.

When Nami held her daughter for the first time, she felt "nothing but bones." Court documents show Runa had weighed 37.5 kilograms before her detention. When released, she weighed 27.7 kilograms—nearly ten kilograms lost in less than three weeks. Her sister Mariko recalled: "When she came out, she was just crying her eyes out." The girl who had once been cheerful, who loved to laugh and chatter, had stopped smiling. She struggled to eat. When her family urged her to go to hospital, Runa refused. "It's like a detention centre, so I'm scared; I might be restrained," she told her sister.

The weight continued to fall. By mid-December, five months after her release, Runa weighed just twenty kilograms. She lost consciousness at home and was rushed by ambulance to hospital. She died the next day of cardiac arrest. Her family believes the trauma of those eighteen days in police custody killed her.

Now they are suing the state for 109 million yen—roughly $987,000—alleging that Runa's arrest and detention were unlawful. Their lawyer, Sasaki Masahiro, argues there was insufficient grounds for arrest: a single statement, no objective evidence gathered, and no legitimate reason to believe a sixteen-year-old girl would flee or destroy evidence. "If a 16-year-old were to run away, where would she live? She simply couldn't do that, could she?" he said.

Runa's case has become a focal point in a broader reckoning with what critics call Japan's "hostage justice" system—the practice of holding suspects in prolonged detention while extracting confessions. Japan's 99 per cent conviction rate has long masked a troubling reality: suspects can be detained without charge for up to twenty days, defence lawyers cannot attend interrogations, and psychological pressure is routine. Even former justice minister Mori Masako, once a defender of the system, now calls it a problem. "They detained her, extended her detention, extended it again … only for it to turn out she was innocent," she told the ABC. "Just think how many innocent people are included in that figure." High-profile cases—including former Nissan CEO Carlos Ghosn, Australian grandmother Donna Nelson, and boxer Hakamata Iwao, who spent fifty years on death row before being acquitted and awarded 1.96 million dollars—have intensified pressure for reform. Runa's family says they are not interested in settling. "Unless authorities concede the prosecution and police acted unlawfully, I'm absolutely certain we won't agree to a settlement, no matter how much money they offer," Sasaki said. The case could take years to move through the courts. But for Nami, the outcome is clear: she wants the trial to send a message that "the entire country and all its citizens must be protected."