The "Sasebo slashing" (佐世保小6女児同級生殺害事件 Sasebo shōroku joji dōkyūsei satsugai jiken?) refers to the murder of a 12-year-old Japanese schoolgirl, Satomi Mitarai (御手洗 怜美 Mitarai Satomi?), by an 11-year-old female classmate. The murder occurred on June 1, 2004 at an elementary school in Sasebo, Nagasaki Prefecture, Japan, and involved the slitting of Mitarai's throat and arms with a utility knife.
The killer's real name has not been released to the press, as per Japanese legal procedures prohibiting the identification of juvenile offenders, and Japanese police referred to her as "Girl A". The Nagasaki District Legal Affairs Bureau cautioned internet community members against their revealing her photos.
The killer became the subject of an Internet meme on Japanese web communities such as 2channel. Users nicknamed her "Nevada-tan" because a class photograph showed a girl believed to be her wearing a University of Nevada, Reno sweatshirt.
On June 1, 2004, the 11-year-old schoolgirl murdered her 12-year-old classmate, Satomi Mitarai, in an otherwise empty classroom during the lunch hour at Okubo Elementary School in Sasebo. She left Mitarai's body at the murder scene and returned to her own classroom, her clothes covered in blood. The girls' teacher, who had noticed that both were missing, found the body and called the police.
After being taken into custody, she was reported as confessing to the crime, saying "I am sorry, I am sorry" to police. She spent the night at the police station, often crying at times, and refused to eat anything. She was offered snacks, but refused to eat them. Eventually, she ate bread and drank juice. However, she initially mentioned no motive. Shortly afterward, she confessed to police that she and Mitarai had quarreled as a result of messages left on the Internet. She claimed that Mitarai slandered her by commenting on her weight and calling her a "goody-goody."
On September 15, 2004, a Japanese Family Court ruled to institutionalize her, putting aside her young age because of the severity of the crime. She was sent to a reformatory in Tochigi prefecture. The Nagasaki family court in 2004 originally sentenced her to two years of involuntary commitment, but it sentenced her to an additional two years of involuntary commitment in September 2006. On May 29, 2008, local authorities announced that they did not seek her additional sentence.
The murder sparked an ongoing debate in Japan about whether the age of criminal responsibility, lowered from 16 to 14 in 2000 due to the 1997 Kobe child murders, needed to be lowered again. The killer was considered to be normal before the incident, which made the public more anxious.
Members of the Japanese Diet, such as Kiichi Inoue and Sadakazu Tanigaki, came under heavy criticism for comments made in the wake of the killing. Inoue was criticized for referring to Girl A as genki (vigorous, lively) due to the word's usual positive connotations. Sadakazu Tanigaki was criticized for referring to the method of killing, slitting of the throat, as a "manly" crime.
Akio Mori cited this case in support of his controversial "game brain" theory, which has been criticized as "superstition". The killer was reported to be a fan of the death-themed flash animation "Red Room", an assertion used in support of the theory.
At the March 18, 2005 Okubo Elementary graduation, students were given a graduation album with a blank page on which they could place pictures of Mitarai, the killer, or class pictures containing both in honor of Mitarai's death. Mitarai was posthumously awarded a graduation certificate, which her father accepted on her behalf. The killer was also awarded a certificate, as one is required in Japan in order to enter junior high, and the school believed it would assist in her "reintegration into society".
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