Twenty years ago, in 2000, an incident occurred in a house in Setagaya Ward, Tokyo.

Mikio Miyazawa (44 at the time), wife Yasuko (41 at the time), Niina-chan (8 at the time) who was the eldest daughter and a second grader, and Rei-kun (6 at the time), the eldest son, are four members of the family. Found to have been murdered.

The case is still unresolved.

A former executive of the Metropolitan Police Department's Investigation Division 1 who was in charge of the investigation said in an interview with NHK that "it is a case that must be resolved."

Mr. Yasunori Hirose (72) who was enrolled in the Investigation Division 1 of the Metropolitan Police Department.

Since 2005, five years after the Setagaya family murder, I have been in the position of an administrator who unites the investigation team.



Mr. Hirose recorded the situation of the investigation at that time in a detailed notebook.

Chasing "Laglan Shirt"

Of the leftover items left on the scene, the one who was particularly particular about chasing was the purchaser of a shirt called the "Laglan Shirt."


At that time, only four stores were selling this shirt in Tokyo.

I tried my best to find out the criminal from the purchaser.

"It was a distinctive shirt anyway. At that time, these shirts were popular with young people, and some people wore them when exercising or taking a walk, or as nightwear when sleeping. With the help of the manufacturer. , I asked a Chinese manufacturer to make it again, distributed it to police stations in Tokyo, and called for information if I had any idea. "

Mr. Hirose visited the house at the scene of the incident many times.


The room was preserved as it was at the time of the incident, leaving a happy atmosphere for the family.

"I imagined that there was a piano and Yasuko was teaching Niina-chan and Rei-kun how to play. It seems that Niina-chan was an active young lady, so I probably learned the piano. I guess he was showing off. "

Sticking to this case, the existence of my wife

Mr. Hirose continues to stick to this incident by visiting the site even after retirement.


There was a wife who died of illness when she was in charge of the case.


When he was at home for nursing, he was scolded by his wife, who usually didn't talk about work.



"When my wife got up in the morning, I was angry,'Why are you at home at this time? I have to go early.' I guess I should go to the investigation headquarters and do something about it."

"What the police can do is 60%, and the other 40% is the eyes of society."

However, he retired as a detective at retirement age without being able to resolve the case.


For Mr. Hirose, who was in charge of numerous violent cases at the Metropolitan Police Department, this was the first case in which the criminal could not be arrested.



"But I'm sorry to say that I can't fulfill my duty to arrest the criminal. I feel that I'm powerless. However, each detective in the Investigation Division 1 has a feeling for the victim. I'm continuing to investigate my regret. I believe that there are advances in science and technology, and that I will approach the criminal and eventually arrest him properly. However, even if the police do everything in their power, the case will be resolved. About 60% can be done for the sake of, and the remaining 40% is the eyes of society. Anything is fine, so please send me as much information as possible. "

Information about the incident is accepted at the investigation headquarters of the Seijo Police Department of the Metropolitan Police Department.



Phone number 03-3482-3829