On December 30, 2000, the Miyazawa family was brutally murdered in their Tokyo home. What makes the Setagaya murders especially chilling isn’t just the violence—it’s the fact that the killer stayed in the house for hours afterward, leaving behind an extraordinary amount of evidence. More than two decades later, the case remains unsolved, becoming Japan’s most infamous cold case and a source of enduring mystery and grief.

In this episode, we explore what happened that night, the baffling clues left behind, and why—despite DNA, fingerprints, and thousands of tips—the killer has never been identified.

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Hernon, M. (2025, December 30). The Setagaya Family Murder Case. Retrieved from Tokyo Weekender: https://www.tokyoweekender.com/art_and_culture/history/the-setagaya-family-murder-case/

Horror Chronicles. (2024, June 17). The Setagaya Family Murders. Retrieved from Horror Chronicles : https://horrorchronicles.com/the-setagaya-family-murders/

Jiji. (2025, December 30). Police continue searching for kille of Setagaya family 25 years on. Retrieved from Japan Times: https://www.japantimes.co.jp/news/2025/12/30/japan/crime-legal/setagaya-murder-search/

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The Setagaya Murders. (n.d.). Retrieved from Unresolved: https://unresolved.me/the-setagaya-murders

Waters, T. (2025, December 11). Setagaya Family Murders Japans most infamous unresolved cases. Retrieved from Joyn Tokyo: https://joyn.tokyo/life-guide/society/setagaya-family-murders