Medium reported severity Involving minors Criminal Charges

Hachioji, Tokyo: police say five high-school students assaulted a 17-year-old boy and demanded 150,000 yen, a figure they believe one of the group got from ChatGPT by asking about settlements for 'sexual harm to a child'

Sankei Shimbun reported on 10 June 2026, and NTV on 13-14 June, that the Tokyo Metropolitan Police Department's juvenile crimes division had arrested five high-school students on suspicion of injury and attempted extortion. According to the police account, late on 27 January 2026 a suspect who had previously dated a 17-year-old high-school boy invited him to a public square in Hachioji, where the group accused him of having touched her younger sister, assaulted him and broke his nose, and then told him to raise 150,000 yen, borrowing from his parents or friends if necessary. About ten people were present. Police believe the amount came from ChatGPT: one of them entered terms such as 'sexual harm to a child', and the chatbot displayed a minimum settlement of 150,000 yen. No payment is reported. Shukan Josei PRIME reports that four of the five admit the allegations and one partly denies them. The allegations are untested.

AI system: ChatGPT (reported); OpenAI
Occurred: 27 Jan 2026 to 28 Jan 2026
Reported: 10 June 2026
Event location: Japan

What the AI did: Communicated with the person
Reported harm: Physical InjuryExploitation or Abuse

Whose AI use: Someone else’s AI use
Setting: Everyday life · Justice

Evidence: AI involvement reported · Causal attribution alleged · 3 sources, 1 underlying account; 4 claims: 4 reported. 3 open questions
People reported harmed: 1 person

AI system as recorded: ChatGPT (OpenAI), queried on a phone by a member of the group during the incident, per the police account

What Happened

Sankei Shimbun (via ITmedia NEWS, 10 June 2026) reports the police allegation that between about 23:20 on 27 January and 01:00 on 28 January 2026, in a public square in Hachioji, the five suspects, who knew each other as motorcycle friends, assaulted a 17-year-old high-school boy, breaking his nose among other injuries, and tried to extort cash by saying '150,000 yen, get it ready even if you have to borrow from your parents or friends.' The police believe the episode began when a suspect who had previously dated the boy invited him on a motorcycle ride and accused him of touching her younger sister. About ten people were present; one of them typed words such as 'sexual harm to a child' (児童に対する性被害) into ChatGPT, and a minimum settlement of 150,000 yen was displayed, which police believe is why that amount was demanded. NTV's report of the same police account says the query was made during the offence (犯行時). Shukan Josei PRIME (11 June 2026) adds, citing a national-newspaper crime reporter, that the victim was surrounded by the suspects and that four suspects admit the allegations while one partly denies them. The exact prompt, the full ChatGPT reply and whether any money changed hands are not reported. Commentary pieces (JBpress, 28 August 2026) repeat the police account.

Reported harm

A 17-year-old boy was assaulted, suffering a broken nose, and was told to produce 150,000 yen; police believe the amount of the extortion demand was taken from a ChatGPT answer about minimum settlements obtained during the incident (Metropolitan Police Department, via Sankei Shimbun and NTV). The assault itself is not attributed to the AI.

Outcome

Unknown

The Metropolitan Police Department's juvenile crimes division (少年事件課) arrested five high-school students on suspicion of injury and attempted extortion; the arrests were reported on 10 June 2026. Shukan Josei PRIME, citing a national-newspaper reporter, says four admit the allegations and one partly denies them. No later proceedings are reported in the read sources; as juveniles, the suspects' cases would not ordinarily be publicly reported.

What remains unknown

The exact prompt entered and the full text of ChatGPT's reply.
Whether any money was paid (the charge is attempted extortion).
The outcome of the juvenile proceedings.

What the evidence supports

AI involvement: reported. The Metropolitan Police Department's account, relayed by Sankei Shimbun and NTV, says a member of the group entered terms such as 'sexual harm to a child' into ChatGPT, which displayed a minimum settlement of 150,000 yen, and that police believe this is why that amount was demanded. The chatbot communicated with a member of the suspect group, not with the boy; the relation is recorded as in the published Zurich planning case. The prompt and full reply are not published.

4 claims: 4 reported. What the statuses mean

Reported Police allege that late on 27 January 2026, after a suspect who had previously dated a 17-year-old high-school boy invited him out on a motorcycle ride and accused him of touching her younger sister, five high-school students assaulted him in a public square in Hachioji and broke his nose.

Causal attribution. Police allegation relayed by the press; not attributed to the AI.

itmedia.co.jp(opens in new tab) supports · Japanese
「5人の逮捕容疑は共謀して1月27日午後11時20分～28日午前1時ごろ、八王子市…の広場で、…男子生徒（17）に暴行を加えて鼻の骨を折るなどのけがを負わせた上」
news.ntv.co.jp(opens in new tab) supports · Japanese
「警視庁によりますと、高校生の少女や少年ら5人はことし1月、東京・八王子市で元交際相手の男子高校生に「妹の体に触ったでしょ」などと言って、暴行を加えケガをさせ、現金を脅し取ろうとした疑いがもたれています。」
itmedia.co.jp(opens in new tab) supports · Japanese
「過去に男子生徒と交際していた女が「ツーリングに行こう」などと呼び出し、「妹の脚を触ったでしょ」などと因縁をつけたのが発端とみられる。」

Reported During the incident a member of the group entered terms such as 'sexual harm to a child' into ChatGPT, which displayed a minimum settlement of 150,000 yen, and police believe this is why the group told the boy to produce 150,000 yen.

Causal attribution. Police belief (とみられる) relayed by the press. The prompt and full reply are not published.

itmedia.co.jp(opens in new tab) supports · Japanese
「現場には当時約10人がおり、1人が対話型生成AI「ChatGPT」に「児童に対する性被害」などと入力したところ、示談金として最低15万円という金額が表示されたことから、脅し取ろうとしたとみられる。」
news.ntv.co.jp(opens in new tab) supports · Japanese
「犯行時、少女の仲間の1人がチャットGPTに「児童に対する性被害」と相談すると、「示談金として最低15万円」と回答があり、現金を要求したとみられています。」
jprime.jp(opens in new tab) supports · Japanese
「この“15万円”という金額は女子高校生の仲間が生成AIの『チャットGPT』に相談して決めたとのこと。“児童に対する性被害”について相談したところ、“示談金は最低15万円”と回答があったそうです。」

Reported The group told the boy to produce 150,000 yen, borrowing from his parents or friends if necessary; the charge is attempted extortion and no payment is reported.

Causal attribution. Police allegation relayed by the press.

itmedia.co.jp(opens in new tab) supports · Japanese
「「15万円、親とか友達に借りてでも用意しろ」などと言って現金を脅し取ろうとしたとしている」; 「傷害と恐喝未遂の疑いで」

Reported Five high-school students were arrested by the Metropolitan Police Department's juvenile crimes division; four admit the allegations and one partly denies them.

Causal attribution. Police arrest announcement; the admission detail comes from a reporter quoted by Shukan Josei PRIME.

itmedia.co.jp(opens in new tab) supports · Japanese
「警視庁少年事件課は傷害と恐喝未遂の疑いで、東京都八王子市の高校3年生の女（17）ら高校生の男女計5人を逮捕した」
jprime.jp(opens in new tab) supports · Japanese
「すでに加害者となった5人は逮捕されていますが、女子生徒ら4人は容疑を認めている中、少年1人は一部否認している状況です」

Sources

3 sources inspected, from 1 underlying account. Sources that repeat one account do not corroborate each other.

Sankei Shimbun via ITmedia NEWS, 10 June 2026: 「妹の脚を触った」因縁つけ仲間に暴行、AI基に恐喝未遂容疑の高校生5人逮捕(opens in new tab)
s1 · itmedia.co.jp · News report · Japanese · Inspected · 10 June 2026 · Shares an underlying account with another listed source · Primary
news.ntv.co.jp(opens in new tab)
s2 · News report · Japanese · Inspected · Shares an underlying account with another listed source
jprime.jp(opens in new tab)
s3 · News report · Japanese · Inspected · Shares an underlying account with another listed source

How the sources were read, and where the events happened

Sankei Shimbun article republished by ITmedia NEWS, full body read in Japanese by curl on 2026-09-29; quotations here are the reviewer's English translations. Relays the Metropolitan Police Department juvenile crimes division's account. Applies to s1.

NTV (Nippon TV) news LOG text summary of a 13 June 2026 broadcast, read in Japanese by curl on 2026-09-29; the video was not viewed. Attributes the facts to the Metropolitan Police Department. Applies to s2.

Shukan Josei PRIME, 11 June 2026, read in Japanese by curl on 2026-09-29. Relies on an unnamed national-newspaper crime reporter whose account tracks the police announcement; grouped with it. Applies to s3.

Event countries: Japan. Affected-person countries: Japan. Court countries: Unknown.

Sankei places the offence in a public square in Hachioji, Tokyo, and describes the victim as a high-school student; the arrests were made by the Tokyo Metropolitan Police Department.

Reviewed for publication 2026-09-29: Published as a police-reported case in which a chatbot answer obtained during an assault supplied the amount of an extortion demand against a 17-year-old. All read reports relay the Tokyo Metropolitan Police Department's account and count as one source chain; the allegations are untested. No suspect or victim is named, and the suspects' relationships are described only as far as needed to explain the event.

People described

A 17-year-old high-school boy in Hachioji, Tokyo (not named), who was injured and from whom money was demanded

People reported harmed in this case

1 person

0 AI participants · 1 other person harmed

The police account names one victim: a 17-year-old high-school boy who was injured and from whom 150,000 yen was demanded (Sankei, NTV). The ChatGPT user was a member of the suspect group; the five arrested suspects and the roughly ten people present are not counted as harmed. Exact count of one.

Counted once within this case. The same person may appear in other cases. This count does not establish AI causation.

Cite this case

Compiled per our published methodology: verification statuses, sourcing standards, and corrections process.

APA

NOPE. (2026). Hachioji, Tokyo: police say five high-school students assaulted a 17-year-old boy and demanded 150,000 yen, a figure they believe one of the group got from ChatGPT by asking about settlements for 'sexual harm to a child'. AI incidents. https://nope.net/incidents/2026-hachioji-high-school-extortion-chatgpt-settlement-figure

BibTeX

@misc{2026_hachioji_high_school_extortion_chatgpt_settlement_figure,
  title = {Hachioji, Tokyo: police say five high-school students assaulted a 17-year-old boy and demanded 150,000 yen, a figure they believe one of the group got from ChatGPT by asking about settlements for 'sexual harm to a child'},
  author = {NOPE},
  year = {2026},
  howpublished = {AI incidents},
  url = {https://nope.net/incidents/2026-hachioji-high-school-extortion-chatgpt-settlement-figure}
}

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