External affairs affects kids and herself

External affairs affects kids and herself

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Tokyo Family Annihilation Tragedy of 2025!

Mother and Four Children Found Dead in Their Home:

What had really Happened in the Missing Five Days?

On Friday, December 19, 2025, a horrific family annihilation occurred in a quiet residential area of ​​Nishi-Tokyo City, Tokyo.

The bodies of 36-year-old mother Yuka Nomura, her 16-year-old eldest son, 11-year-old second son, and 9-year-old third son were found inside.
Only the father, who was working outside, survived.

At 5:30 PM that day, the father returned home from work.

After unlocking the main lock with his key, the door was jammed by the inner U-shaped security chain, allowing him to push it open only a few centimeters.

He called out his wife and children's names, but received no response.

He heard dull thuds coming from the second floor, like heavy objects hitting the floor, followed by silence.

About 20 minutes earlier, the father received a series of anxious messages from his wife on his phone.

She repeatedly asked if he was off work, demanded his location, and even urged him to meet her in "Nerima"—Nerima Ward is adjacent to Nishi-Tokyo City, but not close.

The father tried calling his wife; the call briefly connected but was immediately abruptly ended.

The father immediately called the police.

When the police arrived, they broke down the door.

The first floor was empty; all doors and windows were intact, and there were no signs of forced entry.

The two rooms on the second floor became the scene of the deaths.

In the first room, the mother and her 16-year-old son lay in pools of blood, splattered onto the ceiling, indicating a violent struggle.

Beside the son was a large axe with a blade about 20 centimeters wide, and a blood-stained Japanese kitchen knife.

Both mother and son were covered in knife and slash wounds; the son had multiple defensive wounds on his arms and hands, indicating he had fought back against the attack.

The thumping sounds the father heard outside the door were most likely the sounds of his eldest son's death thud against the floor or the sound of an axe swinging—at that moment, the killing was nearing its end.

The next room presented a completely different scene.

The 11-year-old second son and the 9-year-old third son lay quietly on the bed, their faces bluish-purple, their necks tightly bound with white plastic straps.

The cause of death was mechanical asphyxiation.

Once tightened, these straps cannot be loosened; the perpetrator only needed to instantly slip and tighten them, and the mechanical structure would automatically complete the killing.

Although the two children had cuts, the bleeding was minimal, presumably caused when their hearts stopped beating or they were in near-death shock.

On the same floor, one side witnessed an extremely violent axe fight, the other a silent execution—two drastically different scenes of death, suggesting the killer employed completely different tactics against different objects.

The doors and windows of the house were intact, all windows were locked from the inside, there were no suspicious third-party shoe prints on the floor, and the security chain on the front door could only be manually engaged from the inside—this was a typical locked room mystery.

Police initially leaned towards believing it to be a family tragedy where the mother killed her children and then committed suicide.

However, three days later, the case took a dramatic turn.

Police found an apartment rental agreement in the mother's car.

The address was in Minamidanaka, Nerima Ward, Tokyo, about 6 kilometers from the crime scene.

The contract was signed in late March 2025, in the mother's name, with a monthly rent of 110,000 yen and initial costs of approximately 500,000 yen.

It was a one-bedroom apartment, which she, as a full-time housewife, had secretly maintained for nine months without her husband's knowledge.

Police immediately searched the apartment.

Upon opening the door, a pungent smell of rotting protein filled the air.

A large Western-style kitchen knife lay on the living room sofa.

The bedroom wardrobe door was tightly sealed from the outside with green duct tape, and even the ventilation openings were covered.

Tearing off the tape and opening the wardrobe door revealed a curled-up male corpse inside.

The deceased was identified as 27-year-old Shintaro Nakakubo, a construction company employee.

He was found wearing a long-sleeved shirt and underwear, and was in a relaxed state.

He had more than 10 stab wounds, concentrated on his abdomen, back, and left thigh.

The back wound was deep, reaching his internal organs.

The cause of death was hemorrhagic shock.

The body was clearly decomposed, and the forensic doctor estimated the time of death to be around December 14th or 15th.

The bloodstains on the apartment floor were unnaturally sparse, and the path from the bed to the wardrobe had clearly been cleaned.

An air purifier was found operating inside the wardrobe, its power cord protruding from a gap sealed with tape.

The investigation confirmed that although the apartment was rented under the mother's name, the actual occupant was Shintaro Nakakubo.

Neighbors had repeatedly seen the two entering and leaving together, speculating that they were in an extramarital affair.

Two cases, two crime scenes, five bodies—the case escalated rapidly:

the mother in western Tokyo and the young man in Nerima Ward were an extramarital couple with a nine-year age gap, and this apartment was their love nest, as well as the scene of the first murder.

The last time surveillance footage captured Shintaro Nakakubo was after 6 PM on December 14th, when he returned home with his briefcase and never left the apartment again.

It is speculated that a violent altercation occurred between the two in the apartment between the evening of the 14th and the early morning of the 15th.

On December 16th, Nakakubo's company received a message from his phone:

"Requesting leave due to illness."

However, according to the autopsy results, he was likely already dead by then.

Police later found several of Nakakubo's cell phones in his mother's car, including his work phone—she calmly took the phone after killing her lover, forged the leave message, and prevented the company from reporting him for unexcused absence.

At 10 AM on December 17th, apartment surveillance footage captured the mother carrying a large cardboard box into the living room, containing the air purifier that later appeared next to the wardrobe.

By this time, the body had begun to decompose.

She brought in the air purifier, bought some duct tape, and sealed the body inside the wardrobe.

For five days, from December 14th to 19th, she shuttled between two families:

in Nerima Ward, she was a calm corpse handler;

in Nishi-Tokyo, she was a mother of three, continuing to cook, do laundry, and play her daily role.

Until December 19th, her psychological defenses completely collapsed.

Regarding motives, criminal psychology has the concept of "extended suicide"—in this psychological state, parents see their children as part of themselves.

The 16-year-old eldest son may have sensed his mother's abnormality, and her use of an axe—an extreme form of violence—to deal with him may have been because he was the only one who could physically and cognitively stop her plan.

Based on available information, this tragedy was not a sudden incident, but rather a timeline of accumulated pressure over several months that ultimately spiraled out of control: From March, the mother secretly maintained an extramarital affair, living in a state of concealment and anxiety; in mid-December, a conflict erupted between her and her lover in their apartment, and in a fit of rage, she murdered him; instead of turning herself in, she began extreme cover-ups, taking his phone to fabricate messages and disposing of the body; as the lies could no longer be maintained, she fell into utter despair, developing the thought of "ending it all"; on the afternoon of December 19th, she first strangled her second and third sons with a strap, then fought with her eldest son with an axe, ultimately ending her own life.

Currently, the Metropolitan Police Department is still conducting detailed forensic examinations of the seized phone, letters, and murder weapon.

Although the suspect is dead and cannot stand trial, the police still need to completely close the chain of evidence and present the truth in the form of a case report.