TOKYO (TR) – The Tokyo District Court has sentenced a 26-year-old lady to 12 years in jail for the deadly stabbing of her live-in boyfriend two years. The case make clear a weird and merciless marketing campaign of home abuse centered round his secret hair loss, stories the Sankei Shimbun (Nov. 28).
On November 21, 2025, Kotomi Sato was discovered responsible of harm leading to loss of life for plunging a pair of scissors into the neck of her 26-year-old boyfriend, Yuya Koya, an elite licensed public accountant, inside his luxurious high-rise residence in Nakano Ward.
During the trial, prosecutors revealed a chilling dynamic of home violence during which Sato weaponized the sufferer’s deepest insecurity to maintain him below her management.
The courtroom heard that Sato, initially from Yamaguchi Prefecture, had stop her company job shortly after transferring to Tokyo. She racked up heavy money owed frequenting host golf equipment and finally labored within the dispatch intercourse trade to fund her life-style. In January 2024, she met the rich accountant on a courting app, and the pair rapidly started dwelling collectively.
By April, the sufferer confessed to Sato that he suffered from extreme alopecia and wore a wig to cover his situation.
Rather than providing help, Sato used the key to ruthlessly dominate him. According to messages on the chat app Line offered in courtroom, she would threaten to depart him over his look. She wrote, “You’re too bald. I want someone with hair after all.”
She routinely compelled him into submission by threatening to reveal pictures of him with out his wig on social media. Her management rapidly escalated into bodily violence, with the courtroom listening to she beat him till his face swelled and strictly monitored his every day actions.
The deadly encounter unfolded on the night of September 16, 2024. After a sushi date, the couple started arguing over a trivial matter. When the sufferer uncharacteristically stood his floor as a substitute of instantly apologizing, Sato resorted to her normal blackmail.
“If you don’t fix your mood, I’ll post a picture of you without your wig on SNS,” she threatened, later including, “I already posted it.”
After returning to the residence, Sato armed herself with a pair of scissors that includes an 8-centimeter blade. She claimed in the course of the trial that she solely introduced out the weapon “thinking he would calm down if he saw it,” and argued the deadly wound was a sheer accident that occurred throughout a 10-second wrestle.
The Tokyo District Court dismissed her protection. Noting that the scissors penetrated 6 centimeters deep into the sufferer’s neck and that he lacked any defensive wounds on his physique, the presiding decide dominated that Sato had forcefully swung the blade downward with a transparent intent to assault.
In handing down the 12-year time period, the courtroom condemned the malicious nature of the crime and the psychological torment Sato inflicted on the sufferer by exploiting his bodily vulnerabilities.