How the real murders behind Asako Yuzuki’s hit novel ‘Butter’ exposed Japanese media’s misogyny

Japan, 2009. It is a morning in August and, in a parking lot in Saitama – a regional centre about 30 km north of Tokyo – a rental car is spotted with a man lying in the back seat. His name is Yoshiyuki Oide. But it turns out that he’s not having a quick nap – he’s dead.

The cause of death is carbon monoxide poisoning which is initially thought to be a case of suicide. But the police are not convinced, so they knock on the door of the woman Oide had been dating, 35-year-old Kanae Kijima. This marks the beginning of the investigation into what would become known in the media as the “Konkatsu killer” case. The name derives from konkatsu, meaning marriage hunting.

The investigation uncovered evidence that suggested Kijima had killed three men she met on dating sites. The three deaths were initially considered suicides but were all deemed to have been staged. The court agreed and Kijima – who has always maintained her innocence – was found guilty in 2012, based on what was widely held to be largely circumstantial evidence, and sentenced to death. The decision was upheld in subsequent appeals, and she is now on death row awaiting execution.

Kijima’s case was similar to…

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