Junko Ogata was convicted with Futoshi Matsunaga over the deaths of seven people in Kitakyushu, in Fukuoka Prefecture, Japan, between February 1996 and June 1998. Six of the dead were her own family: her father, her mother, her younger sister, her sister's husband, and her sister's two children, a girl of 10 and a boy of 5. The seventh was the father of a 17-year-old girl whose escape in March 2002 brought the case to light. The court found that Matsunaga was the mastermind and that Ogata carried out his intentions. Investigators never found a body.
Ogata and Matsunaga were both 40 when they were arrested. The Kokura branch of the Fukuoka District Court sentenced both to death in September 2005. In September 2007 the Fukuoka High Court upheld Matsunaga's death sentence but replaced Ogata's with life imprisonment, finding that her position was markedly different from his. The Supreme Court dismissed both appeals on December 12, 2011. The case is known in Japan as the Kitakyushu confinement serial murder case.
Ogata was born on February 25, 1962, in Kurume, in the Chikugo area of southern Fukuoka Prefecture. She was the eldest daughter of a family that owned a relatively large amount of farmland and was locally known as wealthy, according to the journalist Kazuteru Ono, who spent about 20 years reporting on the case and whose book on it was published by Bungeishunju in 2023. Her grandfather had been a village assembly member. Her father farmed about two hectares part time and also worked for a steel wire manufacturer. The household had six members across three generations.
Because the family had no male heir, the expectation was that the eldest daughter would marry a man who would take over the household and its name. Her father was described as strict. Ono reported that she resented the rigidity of these traditions, and her defense lawyers later told the court that she had been irritated by her rural family's customs and her parents' expectations. Ono's 2023 interview with the writer urbansea described the family as local notables in a very strict household that preferred to settle problems privately rather than go to the police or others, partly out of concern for its reputation. That habit would later be used against them.
Former classmates described her to Ono as plain, honest and country raised, quiet and good at her studies. She attended a junior high school in Kurume and then a public high school in the city, where she was in the college-track class. Futoshi Matsunaga, who was born in Kitakyushu in April 1961 and grew up in Yanagawa, attended the same high school for a time before he was expelled. The two barely spoke there. In April 1980 Ogata entered a women's junior college in Fukuoka City, and in April 1982 she began working at a kindergarten in Kurume.
In the summer of 1980, when Ogata was 18, Matsunaga telephoned her at home. He said he wanted to repay 50 yen that she had lent him. She had no memory of lending him anything, and Ono reported that the claim was untrue. A former Fukuoka prefectural police reporter told Ono that Matsunaga had made the call as a prank, because she had the same given name as a woman he was then dating. They met once. Ogata was cautious and nothing came of it.
Matsunaga called again in 1981. By then he ran the futon door-to-door sales business in Yanagawa that his father had taken over from his grandfather, and he presented himself as a successful businessman with musical talent. In January 1982 he married the woman he had been dating. In October 1982, while his wife was pregnant, he invited Ogata out again, and the two began a relationship. Ogata knew he was married. He gave her expensive gifts, told her his marriage was unhappy and that he planned to separate, and asked her to keep the relationship secret. The prosecution later argued in writing that he had targeted her family's assets from the start, and Ono reported that Matsunaga drew information about the family's wealth out of her.
Within about two years Matsunaga changed. He began to insult Ogata and to beat her regularly. A former police reporter told Ono that the violence started around the autumn of 1984 and grew worse over time. After her shifts at the kindergarten she was questioned and hit. Matsunaga had her telephone friends and relatives and read out words he had written for her, and those calls drove them away and left her isolated. Her defense lawyers told the district court in their closing argument that she had come to see his violence as a sign of love.
Matsunaga's business, according to Ono's reporting, grew quickly through deceptive sales and fell away after the economic bubble burst around 1990. He pressed employees and the women around him to take out loans and sign credit contracts in their own names or in false names, and he told people he had ties to organized crime and used that claim to frighten them. In July 1992 police began investigating him for fraud and violent intimidation, and he was later named in a wanted notice. The business collapsed in August 1992. In October 1992 Matsunaga, Ogata and a remaining employee left the Chikugo area and settled in Kitakyushu, where they rented their first apartment on October 13, 1992. Ono reported that for the next decade they could not hold regular jobs, lived as fugitives, and rented several apartments at a time.
Ogata gave birth to her first son by Matsunaga in January 1993. By the time of the couple's arrest in 2002 they had two sons, then aged 9 and 5.
The first of the seven people who died was a 34-year-old man who worked for a real estate company in Kitakyushu. Ono, who uses the pseudonym Yukio Hirota for him, reported that Matsunaga learned of misconduct at the man's workplace through an acquaintance and used it to force him out of his job. From October 1994 the man and his daughter, then a fourth-grade elementary school pupil, lived with Matsunaga and Ogata. Matsunaga used the name Miyazaki and Ogata the name Mori, and the girl never learned their real names.
The district court found that in February 1995 Matsunaga drew the father still deeper into his control, using him as a source of money and as cover for the couple's life on the run, and that Ogata acted on Matsunaga's instructions. The prosecution's closing statement, as Ono reported it, said that the abuse of the father and daughter was carried out by the two defendants together, and that the couple lived in one room while the victims were kept apart from them under strict conditions. The father died in February 1996, in confinement. His daughter, then 11, was present.
Bunshun Online reported in 2025 that Matsunaga then made Ogata believe that she bore responsibility for the man's death, and that this guilt tied her more tightly to him.
From early 1996 to April 1997, according to Bunshun Online's 2025 account, the couple relied on payments from Ogata's mother for their living costs. In April 1997 Ogata ran away. Matsunaga then told her parents that she had been involved in a killing, and the family was summoned to bring her back. From that point he demanded large monthly payments from them, claiming that he was hiding a murderer, and controlled them with threats and punishments.
Ono reported in 2023 that Matsunaga exploited the family's fear of public shame to draw them into covering up his crimes, and so brought them under his control. Her sister's husband, a former police officer, was controlled in the same way, and the couple's two young children were used to keep the family close to him. From about April 1997 the family of six were confined in a Kitakyushu apartment.
The six members of Ogata's family died one by one over the following months. Ono has reported that Matsunaga did not carry out the killings himself but had the family members take part in each other's deaths. His reporting sets out the order:
Her father, 61, died in December 1997. Bunshun Online reported that Matsunaga directed Ogata to act against him in front of the family. The district court found this death to be injury resulting in death, not murder.
Her mother, 58, was killed in January 1998.
Her younger sister, 33, was killed in February 1998.
Her sister's husband, 38, was killed in April 1998.
Her nephew, 5, was killed in May 1998. Bunshun Online reported that Matsunaga directed Ogata to kill the boy, and the Fukuoka High Court later took into account in sentencing that she had tried to persuade Matsunaga not to.
Her niece, 10, was killed in June 1998.
The surviving girl was made to take part in some of these events. She later testified that the relationship between Matsunaga and the Ogata family had been one of "king and slave."
The adults were stripped of their assets. Ono reported in 2024 that a former prosecutor who worked on the case said the flow of money could never be traced and that no large amounts of cash were found among the seized items. Ono reported that Matsunaga had taken more than 100 million yen through his futon business before the move to Kitakyushu, and that most of the couple's money seems to have gone on life as fugitives.
Early on the morning of March 6, 2002, the girl, now 17, escaped and went to her grandparents, who lived in the same city. She told them that her father had been killed. The family reported this first to one Kitakyushu police station and then to another. On March 7, 2002, Fukuoka Prefectural Police made an emergency arrest of Matsunaga and Ogata on suspicion of confining and injuring the girl. Both gave false names and refused to give their real ones.
From the start, the girl told investigators that her father and six of Ogata's relatives had been killed. Tadashi Makino, who became head of the criminal division of the Fukuoka District Public Prosecutors Office in April 2002, told Ono that he found her account credible and that he had believed from the start that the case involved multiple killings. After the arrests, police placed four boys in protective custody: the couple's two sons, aged 9 and 5, and the six-year-old twin sons of another woman. Ono reported that the children had been taught to distrust the police.
The case had to be built without any physical remains of the dead. Makino described his approach to Ono as deciding which crimes to pursue, and in what order, according to what could be fully proven. Investigators seized photographs that showed the girl's father and members of the Ogata family gathered in one room, and written pledges that those people had been made to sign. Inquiries among neighbors and comparisons of photographs showed that the victims had been seen up to a certain period and then disappeared from view.
The charges were filed one at a time. On March 29, 2002, the couple were indicted for confining and injuring the girl. On April 25 they were indicted for confining and injuring a second woman, and on June 7 for fraud and robbery against the same woman. Their trial on those charges opened at the Kokura branch of the Fukuoka District Court on June 3, 2002. On September 18, 2002, they were arrested on a murder charge for the first time, and the trial was put on hold while the investigation continued.
The murder indictments, as Ono listed them, followed this order:
October 8, 2002: murder of her niece, 10.
November 2, 2002: murder of her father (later found by the court to be injury resulting in death).
December 27, 2002: murder of her mother.
February 1, 2003: murder of her nephew, 5.
February 23, 2003: murder of the girl's father.
March 18, 2003: murder of her sister.
June 20, 2003: murder of her sister's husband.
Makino told Ono that the killing of two children who could not resist was unforgivable. A former prosecutor also told Ono that at the indictment stage the prosecutors decided to charge every death as murder, without serious debate about reducing any of them to injury resulting in death, though he acknowledged that the evidence on her father's death had weaknesses and that charging it as murder had been a bold choice.
After her arrest Ogata said nothing under questioning. On October 12, 2002, she was re-arrested on suspicion of murdering her father, and on November 2 she was indicted on that charge. Between those two dates she changed course and gave a full confession. On October 23, 2002, her defense lawyers announced that she had decided of her own will to tell the facts.
Investigators told Ono that her confession was the most important single factor in the case. It gave much greater weight to the circumstantial evidence, which Matsunaga had not expected. A former prosecutor said that the direction of the whole investigation changed mainly when Ogata began to confess. Ono reported that after her full confession Ogata was prepared to accept a death sentence. The writer Shunsuke Nagase, reviewing Ono's 2023 book, wrote that once Matsunaga's hold over her had weakened after her arrest, Ogata expressed deep remorse.
Matsunaga, who had also stayed silent at first, later gave statements meant to protect himself. He said he was not involved in the crimes and was not present at key moments. A former prosecutor told Ono that Matsunaga's statements were hard to disprove because they offered no details that could be checked against the evidence. In interviews and letters to Ono over the years, Matsunaga has continued to deny that he ordered anyone to kill and has called himself innocent.
The first trial ran for 77 sessions between June 2002 and September 2005 at the Kokura branch of the Fukuoka District Court. By the third session of the murder trial, on May 21, 2003, six murder counts had been filed, and the seventh followed. From October 2003 the court sat weekly under Japan's law to speed up trials. At the sixth session, on September 3, 2003, Matsunaga's defense team gave its opening statement.
The surviving girl was the central witness. Ogata's defense argued that she had acted under Matsunaga's control. Her lawyers described in detail the violence she had suffered and her belief that it showed his love.
Prosecutors sought the death penalty for both defendants on March 2, 2005.
On September 28, 2005, the Kokura branch of the Fukuoka District Court sentenced both Matsunaga and Ogata to death. It upheld the murder charges for six of the victims and found that her father's death was injury resulting in death rather than murder. The court described Matsunaga as the mastermind and found that he had made the family members distrust one another and had isolated them. It found that Ogata quickly understood his intentions and acted actively and on her own initiative to carry them out. Bunshun Online's summary of the court's characterization described Matsunaga as a ringleader who had lost all restraint between right and wrong, and Ogata as a simple, obedient executor.
Matsunaga appealed to the Fukuoka High Court on the same day. Ogata appealed on October 11, 2005, after her defense team persuaded her to do so. The prosecutors did not appeal the first-instance ruling.
The appeal hearings began at the Fukuoka High Court on January 24, 2007. Ogata's defense filed its appeal brief in August 2006 and a supplementary brief in mid-January 2007. Matsunaga's lawyers also filed briefs. Makino, who had by then moved to the Fukuoka High Public Prosecutors Office as head of its public security division, prepared the prosecution's written replies and appeared in court for the prosecution.
The prosecution's position was that Ogata had joined in the crimes of her own will and for her own benefit, including avoiding arrest, and was not acting under coercion alone. "The series of crimes could not have been carried out without Ogata," Makino told Ono, explaining that Matsunaga himself had not carried out the killings. The prosecutors did not deny that she had been a victim of domestic violence, but they argued that her case differed from that of ordinary victims because she had gone on to commit far more serious crimes.
Ogata's defense called a university professor, now emeritus, who had made a psychological assessment of her, and a counselor from a private group that supports people affected by domestic violence.
On September 26, 2007, the Fukuoka High Court upheld Matsunaga's death sentence and set aside Ogata's, sentencing her instead to life imprisonment. The court said that her attempt to persuade Matsunaga not to kill her nephew should be taken into account in sentencing. It found that she was unlikely to reoffend and that her circumstances were "markedly different" from Matsunaga's, and it concluded that death was too severe a sentence for her. Bunshun Online reported that the court pointed to the possibility that Matsunaga's violence had left her in the psychological state typical of victims of domestic violence. In Ono's 2019 summary, the court reduced her sentence on the ground that she had been under Matsunaga's strong influence.
Makino told Ono that he was surprised. "I didn't expect it at all," he said. As he listened to the reasons being read, he noticed that points in Ogata's favor kept coming up, especially toward the end, and sensed that something was different. The prosecution reported the ruling to its superiors at once and decided to appeal to the Supreme Court, seeking to have the life sentence overturned and the case sent back.
Matsunaga appealed his death sentence to the Supreme Court, and the Fukuoka High Public Prosecutors Office appealed against Ogata's life sentence. On December 12, 2011, the Supreme Court dismissed both appeals. Matsunaga's death sentence and Ogata's life sentence became final on the same day.
Makino said he accepted the decision because it was the court's to make. Speaking personally, he told Ono that it might have been better for Ogata to have gone to the gallows. "It feels like she is being kept alive in a strange way," he said. "I think it is hard for Ogata herself, too." He also said the case had shown how hard it is to judge sentences in crimes carried out through mind control, since it was a case in which mind control led people to commit murder.
From 2011 Ogata was a serving prisoner and Matsunaga a death-row inmate. In July 2025 Bunshun Online still described her life sentence as in force and Matsunaga as awaiting execution.
Ono has continued to write about the case. His book on it, the result of about 20 years of reporting that included repeated prison visits with Matsunaga and close study of the court records, was published by Bungeishunju on February 8, 2023. In 2024 he revisited the apartments the couple had rented in Kitakyushu; he counted 14 rooms in the city that could be confirmed as theirs, and at least 16 in all, and visited each of the 14 some 22 years after the arrest.
Deaths that were never charged. Ono has reported on two deaths in 1993 and 1994 that were never brought to court. In early 1993 the employee who had followed the couple from Yanagawa and had been supporting them left after violence from Matsunaga, and Matsunaga turned to a woman he had known earlier as a new source of money. That woman, 32, and her two-year-old daughter died between October 1993 and March 1994 while they were living with Matsunaga, Ogata and the couple's son. The girl died in hospital in October 1993 of a head injury. At the time police treated her death as an accident; Ogata was questioned and an autopsy was carried out. Ono reported that after the 2002 arrests some investigators came to believe that Matsunaga had killed the child, but no charge was brought over either death, and Ono has described both as unsolved. Neither death forms part of Ogata's conviction.
Matsunaga's denials. Matsunaga has always denied ordering any killing. He has said that there is no recording of any such instruction and has pointed to his statements in the appeal proceedings. The courts rejected his account at every level.
Her responsibility. The two levels of court that heard the facts reached different conclusions on sentence from the same record. The district court called Ogata an active and willing executor of Matsunaga's intentions; the High Court found her position markedly different from his, gave weight to the effect of his long violence against her, and spared her life. The prosecutor who argued the appeal still maintains that the killings could not have happened without her. The debate over how far a person under that kind of control is responsible has continued in Japanese commentary on the case.
1961, April: Futoshi Matsunaga born in Kitakyushu; his family later moves to Yanagawa.
1962, February 25: Junko Ogata born in Kurume, Fukuoka Prefecture.
1980, April: Ogata enters a women's junior college in Fukuoka City.
1980, summer: Matsunaga, a former high school classmate, telephones her.
1982, January: Matsunaga marries another woman.
1982, April: Ogata starts work at a kindergarten in Kurume.
1982, October: Ogata and Matsunaga begin a relationship.
1984, about autumn: Matsunaga's violence against Ogata begins.
1992, July: Police begin investigating Matsunaga for fraud and intimidation; he is later named in a wanted notice.
1992, August: His futon sales business collapses.
1992, October 13: The couple rent their first apartment in Kitakyushu.
1993, January: Ogata's first son is born.
1993, October, to 1994, March: A woman living with the couple and her two-year-old daughter die; neither death is charged.
1994, October: A real estate company employee and his daughter begin living with the couple.
1996, February: The girl's father, 34, dies in confinement.
1997, April: Ogata runs away; her family is drawn in and, from about this time, confined in Kitakyushu.
1997, December: Her father, 61, dies (later found to be injury resulting in death).
1998, January: Her mother, 58, is killed.
1998, February: Her sister, 33, is killed.
1998, April: Her sister's husband, 38, is killed.
1998, May: Her nephew, 5, is killed.
1998, June: Her niece, 10, is killed.
2002, March 6: The 17-year-old girl escapes to her grandparents.
2002, March 7: Matsunaga and Ogata arrested on suspicion of confining and injuring the girl.
2002, June 3: First trial session at the Kokura branch of the Fukuoka District Court.
2002, September 18: First arrest on a murder charge.
2002, October 12: Ogata re-arrested over her father's death.
2002, October 23: Her lawyers announce that she has decided to tell the facts.
2002, October 8, to 2003, June 20: Seven murder indictments filed.
2005, March 2: Prosecutors seek the death penalty for both.
2005, September 28: Both sentenced to death; her father's death found to be injury resulting in death.
2005, October 11: Ogata appeals.
2007, January 24: Appeal hearings begin at the Fukuoka High Court.
2007, September 26: Matsunaga's death sentence upheld; Ogata's replaced with life imprisonment.
2011, December 12: Supreme Court dismisses both appeals; both sentences final.
2023, February 8: Kazuteru Ono's book on the case published by Bungeishunju.
2025, July: Bunshun Online reports describe her life sentence and his death sentence as standing.