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[The Amagasaki Demon: Unraveling the 25-Year Reign of Terror by Miyoko Sumida]-[The Piranha (PODCAST EXCLUSIVE EPISODE)]

MrBallen Podcast: Strange, Dark & Mysterious Stories · B2 · 2025-05-05

True crime
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📋 Summary

The Amagasaki Demon: Unraveling a 25-Year Reign of Terror

The Discovery of the Metal Drum

In November 2011, a routine job at an abandoned warehouse in Amagasaki, Japan, turned into a nightmare for a work crew. While moving cargo, they discovered an unmarked metal drum. Upon prying it open, they found the "twisted body of a dead woman," partially encased in hardened cement. The victim was later identified through dental records as 66-year-old Kazuko Oe. Officer Sato, the lead investigator, noted the victim was "shockingly thin, almost emaciated," and showed signs of severe bruising, suggesting she had been "beaten before she was killed."

A Family Under Siege

Initial investigations led Sato to the victim's family, including her daughter, Kai Oe. The family’s behavior was deeply unsettling; they appeared malnourished and were living in squalor. Despite the suspicious circumstances, the family members provided a unified, albeit transparently false, narrative: they claimed Kazuko had "taken her own life." Sato quickly realized that while the family seemed guilty of something, they were physically too weak to have orchestrated the complex disposal of the body. He sensed they were "under the thumb of a vicious Yakuza gang."

The Mastermind Behind the Curtain

As the investigation deepened, it was revealed that the entire Oe family had been trapped in a web of psychological and physical control. The true architect of this horror was not a traditional Yakuza boss, but a 63-year-old woman named Miyoko Sumida—the very person who had initially reported Kai missing to the police. Miyoko, acting as a "serial killer and a cult leader," had infiltrated the family, gained their trust, and then utilized "mind control" to turn family members against one another. She had successfully manipulated Kai and her sister into beating their own mother to death, ultimately aiming to inherit the family’s assets.

A Legacy of Systematic Destruction

The case expanded significantly in October 2012 when police discovered three more bodies buried beneath the floor of a residential home. Investigations revealed that Miyoko had been operating this "secret and twisted reign of terror" for over 25 years. By using her father’s methods—a mix of financial dependency, isolation, and brutal physical violence—she had infiltrated and destroyed at least five families. She compelled her victims to commit crimes against their own kin, effectively forcing them to do her bidding while she remained in the shadows.

The Fate of the "Piranha"

Though Miyoko was charged with eight murders, authorities believe the true death toll may be even higher. The victims, including Kai and her sister, were ultimately treated as captives of Miyoko’s psychological warfare. In December 2012, Miyoko Sumida died by suicide in her prison cell. Known in Japan as the "Killer Grandma," "Piranha," or "the Demon," her case remains one of the most bizarre and chilling examples of human manipulation and cruelty in modern Japanese history. To this day, the sheer scale of her influence leaves many questioning how one individual could so thoroughly dismantle the lives of so many for over two decades.

🎯Key Sentences

1
It was like she had vanished into thin air.
2
Now, Sato's mind began to race.
3
I have important information about Kazuko Oe's murder.
4
Sato had hit another dead end.
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📝Key Phrases

1
vanish into thin air
2
look into
3
at some point
4
not budge
5
in good spirits
Expand All

📖 Transcript

Hey, Prime members, you can binge eight new episodes of the Mr. Ballin podcast one month early and all episodes ad-free on Amazon Music.
Download the Amazon Music app today. In 2011, a police officer spotted a woman on a busy street in Japan, and he couldn't believe what he was seeing.
He looked at a photo on his phone and then back at this woman and thought, yeah, that's definitely her.
He'd been tasked with finding this woman and bringing her back home.
It was a pretty basic task, but he'd managed to complete it way faster than he thought he would.
The officer rushed down the street, greeted the woman, and she confirmed that yes, she was the person he was looking for.

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