In 2021, Mayuko Inada, a 25-year-old karaoke pub owner in Osaka, was stalked and murdered by Hiroshi Miyamoto, a married engineer who persistently harassed her despite clear rejection. Miyamoto sent her numerous daily messages, followed her, and ultimately attacked her at her shop, stabbing her multiple times and tying her hands. He was arrested, denied charges initially, but DNA and fingerprint evidence linked him to the crime. In 2022, he was sentenced to 20 years in prison.
Country: Japan
State/Province: None
City/Region: Osaka
Incident Type: Murder
Relationship Status: Unknown
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Incident Date: June 11, 2021
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How the relationship or connection began.
Important relationship phases recorded for this case.
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2021-06-11
Recorded relationship or case outcome.
English labels are shown first. Original-language titles are preserved for source verification.
ゆっくりミステリー事件簿 · Original language: English
Osaka Karaoke Pub Stalking Murder
Stalking
The case involves a persistent stalking pattern where the suspect, despite being married, developed an obsessive fixation on the victim, a karaoke pub employee and later owner. The suspect's behavior escalated from frequent visits and persistent messaging to violent murder after repeated rejection. The suspect misinterpreted polite responses as consent, demonstrating a distorted perception of the relationship.
Police investigation focused quickly on Miyamoto after victim's disappearance. Evidence included victim's DNA on suspect's clothing, suspect's fingerprints on adhesive tape used to bind victim, purchase records of tape, and suspect's wedding ring found at the scene with victim's skin cells. The suspect denied charges initially but admitted to sending numerous messages. Trial concluded with a 20-year prison sentence; suspect appealed.
Suspect denied involvement and questioned evidence credibility, including blood location on clothing. He claimed victim consented to messaging, creating conflicting narratives during trial.
Miyamoto met Inada at her workplace and developed an obsessive fixation. Despite rejection and victim's clear requests to stop contact, Miyamoto continued daily visits and harassment via LINE messages. On June 11, 2021, Miyamoto attacked Inada at her shop, tying her hands and stabbing her multiple times. He attempted to delay discovery by locking the shop and disabling security footage. Victim was found three days later. Evidence linked Miyamoto to the crime, leading to arrest and conviction.
High risk due to persistent stalking, escalation to violence, and obsessive behavior despite clear rejection. The suspect's actions included physical stalking, harassment via messages, and premeditated murder tactics.
Persistent stalking and harassment can escalate to lethal violence even when the victim clearly rejects the perpetrator. Polite or professional responses may be misinterpreted as consent by stalkers. Early intervention and stronger protective measures are critical to prevent such tragedies.
Persistent daily visits despite rejection, excessive messaging including guilt-tripping and blaming, following victim outside workplace, and waiting for victim alone after closing.
Victim's DNA on suspect's clothing, suspect's fingerprints on adhesive tape, purchase of tape near suspect's workplace, suspect's wedding ring at scene with victim's skin cells.
DNA evidence, fingerprint analysis, purchase records, security camera footage (partially disabled), suspect's own admissions during trial.
Neighbors reported suspect's sudden anger in unrelated incident; victim's acquaintances noted victim's stress and complaints about suspect; concerned acquaintance requested shop opening leading to victim's discovery.
Trial revealed suspect's denial and claims of victim's consent to messaging; sentencing to 20 years imprisonment; suspect appealed seeking harsher sentence.
Exact psychological motives behind suspect's obsession remain unclear; suspect's contradictory statements during trial create some ambiguity.