In the affluent Tokyo suburb of Setagaya, the Miyazawa family was preparing for New Year's Eve 2000 when their home became the scene of one of Japan's most perplexing crimes. Mikio (44), Yasuko (41), eight-year-old Niina, and six-year-old Rei were brutally murdered by an unknown intruder who then did the unthinkable—he stayed.

For up to 10 hours after the killings, the perpetrator made himself at home in their house. He ate four containers of ice cream, used their computer to browse the internet, attempted to buy theater tickets, and even took a nap on their sofa. He left behind a treasure trove of evidence: DNA, fingerprints, clothing, the murder weapons, and even unflushed feces containing traces of his last meal.

Despite this overwhelming forensic evidence and one of the largest investigations in Japanese history involving over 280,000 officers, the killer has never been identified. The case challenges everything we think we know about criminal behavior and investigative capabilities.

Join me as we examine the psychological profile of a killer whose intent extended far beyond murder—someone who wanted to violate every boundary of human decency and demonstrate his complete control over life, death, and the very concept of home as sanctuary.

This episode explores the darkest possibilities of criminal intent and asks the haunting question: what drives someone to not just kill, but to make themselves comfortable in the aftermath of their own evil?

Content Warning: This episode contains detailed discussions of violence against children and families.

Follow Deadly Intent for more deep dives into the psychology behind the crime.

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