On the night of December 30th, 2000 in the Setagaya Ward in Tokyo Japan, the Miyazawa family which included Mikio his wife Yasuko and their 2 children Niina and Rei would be brutally murdered in their home. The killer made some head scratching decisions that to even this day nobody can fully understand.

Sources:

Waters, Tobias, “Setagaya Family Murders: Japan’s Most Infamous Unsolved Case”, Joyn Tokyo, October 30th, 2025, https://joyn.tokyo/about-japan/society/setagaya-family-murders?.com Accessed December 12th, 2025

“The Setagaya Murders”, Unresolved, https://unresolved.me/the-setagaya-murders, Accessed December 12th, 2025

Kennedy, “The Setagaya Family Murders: 10 Facts About The Unsolved Case”, Discover Walks Blog, June 9th, 2023, https://www.discoverwalks.com/blog/japan/the-setagaya-family-murders-10-facts-about-the-unsolved-case/, Accessed December 12th, 2025

Towner, City, “The Setagaya Family Murders in Kamisoshigaya Japan”, City Towner, May 28th, 2025, https://citytowner.com/setagaya-family-murders-kamisoshigaya-japan/, Accessed December 12th, 2025