56case filesUpdated Jul 18, 2026
Casepin holds 56 case files in Japan. By legal status, 7 marked unsolved, 3 marked cold, 3 marked ongoing, 41 marked solved and 2 marked overturned.
Credit: L26CC BY-SA 4.0SourceSOLVEDListenKyoto Animation Studio 1, Fushimi Ward, Kyoto, Japan · 2019
On 18 July 2019, an arsonist set fire to Kyoto Animation's Studio 1 building in Kyoto, Japan, killing 36 people and injuring 34 others in one of the deadliest attacks in Japan since World War II. Shinji Aoba was convicted of murder and sentenced to death in January 2024.
Near Yamato-Saidaiji Station, Nara City, Nara Prefecture, Japan · 2022
On 8 July 2022, former Japanese prime minister Shinzo Abe was fatally shot with a homemade firearm while giving a campaign speech in Nara City, Japan. Tetsuya Yamagami was arrested at the scene, later convicted of murder, and sentenced to life in prison in January 2026.
Credit: UnknownEditorial useSourceSOLVEDListenOkegawa Station, Okegawa, Saitama Prefecture, Japan · 1999
Shiori Ino, a 21-year-old university student, was fatally stabbed in Okegawa, Saitama, Japan, on 26 October 1999 in a contract killing arranged by her abusive former boyfriend, after police repeatedly declined to act on her stalking reports.
Fukuyama, Hiroshima Prefecture, Japan (site of first known poisoning; incidents occurred across western and central Japan, including Tokyo) · 1985
In 1985, an unidentified person or persons placed herbicide-laced energy drinks in and around vending machines across western and central Japan, killing at least ten to thirteen people and sickening 35 more. No suspect was ever identified, and the case remains unsolved.
SOLVEDListenShinjuku, Tokyo, Japan · 2018
In May 2019, Yuka Takaoka stabbed her boyfriend, Phoenix Luna, with a kitchen knife in their Shinjuku, Tokyo apartment after viewing photos on his phone; she was convicted of attempted murder in December 2019 and sentenced to 3½ years in prison.
Shizuoka Prefecture, Japan · 1966
In 1966, an executive, his wife, and their two children were found stabbed to death after a fire at their home in Shizuoka Prefecture, Japan. Former boxer Iwao Hakamada was convicted and sentenced to death in 1968 based on a disputed confession and contested physical evidence; after nearly five decades on death row, DNA testing led to his release in 2014 and acquittal in a 2024 retrial.
Credit: 松竹キネマPublic domainSourceSOLVEDListenMt. Sakata, Ōiso town, Kanagawa Prefecture, Japan · 1932
In May 1932, a man and woman were found dead atop Mt. Sakata in Ōiso, Japan, in an apparent double suicide by poison; the ensuing media frenzy, a body-snatching incident, and a hit film adaptation were linked by contemporaries and later commentators to a wave of copycat suicides.
Credit: Wikimedia CommonsPublic domainSourceSOLVEDListenHibiya Public Hall, Tokyo, Japan · 1960
On 12 October 1960, Japan Socialist Party chairman Inejirō Asanuma was fatally stabbed with a wakizashi by 17-year-old ultranationalist Otoya Yamaguchi, identified as the assailant, during a televised political debate in Tokyo. Yamaguchi was arrested, confessed, and died by suicide in custody on 2 November 1960.
Credit: HadgeCC BY-SA 3.0SourceSOLVEDListenShimizudani, Kioichō, Chiyoda, Tokyo, Japan · 1878
On May 14, 1878, Ōkubo Toshimichi, Japan's Minister of the Interior, was killed by six former samurai in Kioichō, Tokyo, in an attack that also killed his coachman; all six assailants surrendered the same day and were executed after trial.
Mitsubishi Heavy Industries headquarters, Marunouchi, Tokyo, Japan · 1974
On 30 August 1974, a bomb planted by the East Asia Anti-Japan Armed Front exploded at Mitsubishi Heavy Industries' Tokyo headquarters, killing eight people and injuring at least 376 others in what was then Japan's deadliest terrorist attack.
The files run from 645 to 2023. The 2000s hold the most, with 13 files. The oldest is Assassination of Soga no Iruka (Isshi incident), from 645.
By type, the largest groups are murder and homicide cases (38), kidnapping and abduction cases (10) and robbery and burglary cases (8).
11 files of the 56 have coverage attached: 20 videos, podcasts and documentaries from 7 creators. The most covered is Kyoto Animation arson attack, with 3 items to watch or hear. Coffeehouse Crime, Dr. Todd Grande and The Casual Criminalist have covered the most of them.
Every file is written from cited sources and pinned where it happened, and every person named carries the legal status the record gives them. If you hold information about an unsolved case, contact the investigating agency named in its file rather than posting it publicly. Families and anyone involved can request a correction from any file.
Kyoto animation arson attack 3 20190721 — Credit: L26CC BY-SA 4.0Source
Watarase~river — Credit: ホッカイロCC BY 2.5Source
Shinzō Abe 20120501 — Credit: Prime Minister of Japan OfficialCC BY 4.0Source
Junko Furuta — Credit: Furuta familyEditorial useSource
Shiori Ino — Credit: UnknownEditorial useSource
Drink vending machine at Narita Airport — Credit: Chiara CoetzeeCC0Source
Tsukui Yamayuri En 2021-11-11 — Credit: AsanagiCC0Source
200801 Nikko Tosho-gu Nikko Japan04s3 — Credit: 663highlandCC BY-SA 4.0Source
School gate in junior high school where boy A put boy's neck — Credit: 山井書店CC BY-SA 3.0Source
Tengoku ni Musubu Koi — Credit: 松竹キネマPublic domainSource
Isaac J Hurt's draft card — Credit: National Archives and Records AdministrationPublic domainSource
Inejiro Asanuma — Credit: Wikimedia CommonsPublic domainSource
Katsuyama Marines — Credit: U.S. MilitaryPublic domainSource
Okubo-Toshimichi Kioi-no-hen — Credit: HadgeCC BY-SA 3.0Source
Omachi Dam park Sakamoto Tatsuhiko cenotaph — Credit: photo: Qurren (talk) Taken with Canon IXY DIGITAL 450 (Digital IXUS 430)CC BY-SA 3.0Source
Victime’s House of Murder Case in Komae — Credit: イカしたイカCC BY-SA 4.0Source
大分県立芸術文化短期大学正門 — Credit: ちよ氏CC BY-SA 3.0Source
Marunouchi 2chome Building 2012-10-08 — Credit: AsanagiCC0Source
Tokusoban-Nichiroku-20th-Century-volume-3-1 — Credit: Unknown photographerPublic domainSource56. By status: 7 unsolved, 3 cold, 3 ongoing, 41 solved and 2 overturned. The count covers published files only and changes as new files clear review.
Assassination of Soga no Iruka (Isshi incident), from 645. Open the file
Kyoto Animation arson attack, with 3 videos, podcasts and documentaries linked from its file. Open the file
Coffeehouse Crime (5 cases), Dr. Todd Grande (1 case) and The Casual Criminalist (1 case), among 7 creators in all.
It rebuilds hourly from the published files; the newest file change here is dated Jul 18, 2026. A status changes only when the record behind it does.
