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They posted that they wanted to die. A stranger answered. Nine women disappeared after posting their darkest thoughts online. What police found inside his apartment horrified even seasoned investigators.
In 2017, a quiet apartment in Zama, Japan became the centre of one of the most disturbing true crime investigations in modern history. Inside, police discovered evidence that would shock the world and earn one man a nickname that still sends chills through true crime communities today.
His name was Takahiro Shiraishi.
What began as a missing persons investigation quickly uncovered a case unlike anything investigators had seen before. Using social media, Shiraishi searched for vulnerable young women who had publicly expressed feelings of loneliness, depression, hopelessness, or suicidal thoughts. He presented himself as someone who understood them. Someone who could help them.
Instead, he was leading them directly into a nightmare.
This is the chilling true story of the Zama Nine Murders — the case of Takahiro Shiraishi, also known as the “Twitter Killer” — a serial killer whose crimes shocked Japan and sparked worldwide conversations about online safety, social media predators, criminal psychology, and the dangers of digital manipulation.
In today’s true crime deep dive, we’re breaking down the entire case from start to finish — including Takahiro Shiraishi’s background, the victims, the social media messages, the disappearances, the police investigation, the apartment discovery, the forensic evidence, the arrests, the trial, and the disturbing revelations that emerged in court.
What makes this case so terrifying isn’t simply the number of victims.
It’s how he found them.
The internet was supposed to connect people. Shiraishi used it as a hunting ground. He deliberately searched for individuals experiencing some of the darkest moments of their lives and exploited their vulnerability for his own horrific purposes.
Investigators would later uncover a carefully calculated pattern. Victim after victim had been contacted through social media. Many believed they were speaking to someone who understood their pain. Instead, they were communicating with one of the most dangerous predators in modern Japanese criminal history.
The discovery inside the apartment transformed what initially appeared to be a missing persons case into an international headline. News outlets across the world covered the investigation, while criminal psychologists attempted to understand how a seemingly ordinary man had committed crimes that many found almost impossible to comprehend.
The Takahiro Shiraishi case remains one of the most infamous serial killer investigations in recent history. It continues to be discussed within true crime communities because of the social media element, the criminal psychology involved, the manipulation of vulnerable victims, and the shocking evidence uncovered during the investigation.
This case explores criminal psychology, serial killers, online predators, forensic investigation, victimology, social media crime, digital manipulation, behavioural analysis, and the devastating impact these crimes had on families across Japan.
If you enjoy disturbing true crime documentaries, solved true crime cases, criminal psychology, serial killer investigations, forensic evidence, long-form true crime deep dives, and true crime and makeup content, you’re in the right place.
Let me know your thoughts below. Do you think the Takahiro Shiraishi case is one of the most disturbing examples of a killer exploiting social media in modern history?
Podcast: True Crime w/ Anna Templeton