A Quiet Neighborhood in Tokyo
In the closing days of the year 2000, the Miyazawa family lived an unremarkable life in Kamisoshigaya, a residential pocket of Setagaya Ward on Tokyo’s western edge. Mikio Miyazawa, 44, worked for a trading company and often handled business correspondence from a small study on the ground floor of the family’s home. His wife, Yasuko, 41, managed the household, while their two children, eight-year-old Niina and six-year-old Rei, attended the local elementary school. Yasuko’s mother, Haruko, lived next door and saw the family almost daily.
Their house sat beside Soshigaya Park, a green space so popular with local children that it had earned the nickname “Choo-Choo Train Park.” The home itself was compact by necessity: a ground floor with a garage, dining area, and study; a mezzanine level with a bathroom and the children’s shared bedroom; a second floor housing the kitchen and living room; and, reached only by a pull-down ladder, a low-ceilinged attic where the parents slept. The family had spoken about finding somewhere bigger, but no concrete plans had been made.
An Ordinary Evening Turns
December 30 began like countless evenings before it. The family ran errands, shared a simple dinner, and settled into their usual routines. Niina slipped next door to watch television with her grandmother before returning home. At 10:38 p.m., Mikio logged into his password-protected work email from the ground-floor study — the last confirmed activity from anyone in the house.
As the household settled for the night, one detail proved fatal: the bathroom window on the mezzanine level, which overlooked the park, had again been left open, as it often was.
Sometime around 11 p.m., someone emerged from the darkness of Soshigaya Park. Using the exterior air-conditioning unit as a foothold, the intruder scaled the back fence, reached the open window, carefully removed the mosquito screen, and set it down outside before climbing through — leaving muddied footprints on the bathroom floor as he did.
The Attack Begins
The intruder moved directly to the room where Rei slept on the lower half of a bunk bed he shared with his sister. Without waking the boy, he strangled him. Death came within minutes, and there was little sign of a struggle around the child’s body.
It’s believed Mikio then became aware that something was wrong and rushed toward the sound. What followed was a violent confrontation on the staircase. The intruder carried a knife and used it repeatedly; at some point the blade’s tip snapped off and lodged in Mikio’s skull, while the intruder himself sustained a cut to his hand in the struggle. Mikio fought back hard enough to leave defensive wounds across his hands, arms, and torso, along with blood spatter across the stairwell walls before he collapsed near the front door.
By this point, Yasuko and Niina were awake in the attic. The intruder, now bleeding from his own injuries, turned his attention to them, switching at some stage to a kitchen knife taken from the family’s own collection. The attack against mother and daughter was extensive, leaving dozens of wounds between them; Niina’s death was ultimately attributed to a severed spinal cord. All four members of the family were dead shortly after midnight, transitioning from December 30 into December 31, 2000.