‘Polygamist’ in Japan allegedly created brainwashing manual to control women
Published By admin
TOKYO — Police have found a document analyzing a woman’s personality and upbringing on the computer of a man claiming to practice “polygamy” arrested with two other women for allegedly secretly filming and then selling videos of sexual intercourse with a female partner online, investigative sources have told the Mainichi Shimbun.
The Metropolitan Police Department (MPD) believes that 39-year-old suspect Yohei Ono created the document as a “brainwashing manual” to control women. Ono, of unknown residence and occupation, lived with multiple women and recorded in the document actual instances of making a woman obey him.
According to the MPD and investigative sources, the roughly 10-page file was on a PC confiscated from a condominium apartment in Tokyo’s Shinjuku Ward that had been used by Ono and the other suspects. Ono was arrested in November 2025 for allegedly confining a teenager inside the apartment after meeting her on social media.
The seized document elaborates on the teen’s personality and upbringing, and included records of at least one case where Ono could guide her as he wanted. The file also contained his apparent desire to “make the child born to my wife a wife and have her give birth to our child.”
Ono put a collar around the teen’s neck and called her “inu” (dog), while calling his wife and adopted daughter “penguin” and “usagi” (rabbit) while they lived with him.
On Jan. 6, the MPD’s first investigation division served fresh arrest warrants to Ono, his 28-year-old wife Haruka and adopted daughter Rin, 24, for allegedly illegally filming and distributing sex videos.
The trio are specifically accused of secretly filming a sex partner of Ono’s in her 20s at a hotel in Tokyo’s Shinjuku Ward in June 2024 and posting the videos online in October. Police say that Ono has admitted to the allegations, while his wife and daughter apparently remain silent.
The MPD believes that from March 2023 onward Ono and the other suspects sold about 1,000 sex videos online that secretly captured over 100 women and took in more than 55 million yen (approx. $351,000) in revenue.
(Japanese original by Kengo Suga, Yuka Asahina and Yuga Matsumoto, Tokyo City News Department)
Content retrieved from: https://mainichi.jp/english/articles/20260107/p2a/00m/0na/008000c.
