10case filesUpdated Jul 13, 2026
Casepin holds 10 unsolved cases in Japan. By legal status, 7 marked unsolved and 3 marked cold. On Casepin a case is unsolved when no one has been convicted for it; files the record marks as cold, where active investigation has stalled, are counted here too and carry their own Cold label.
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.
COLDListenShinjuku and Kabukicho, Tokyo, Japan · 1981
Three women were strangled in love hotels in Tokyo's Shinjuku and Kabukicho districts in 1981, and a fourth woman survived a similar attack; the case remains unsolved and the statute of limitations has expired.
UNSOLVEDListenMuroran, Iburi, Hokkaido, Japan · 2001
Asami Chida, a 16-year-old high school student, vanished in Muroran, Hokkaido, on March 6, 2001, after apparently heading to a part-time bakery job; the case remains unsolved more than two decades later.
COLDListenInokashira Park, between Mitaka and Musashino, Tokyo, Japan · 1994
In April 1994, a janitor discovered 27 dismembered human body parts in trash cans at Inokashira Park in Tokyo. The victim, a 35-year-old architect identified only as "S," had been dismembered with unusual medical precision, and the case remains unsolved.
The files run from 1945 to 2018. The 1980s hold the most, with 3 files. The oldest is Shinjuku–Kabukicho Love Hotel murders, from 1981.
By type, the largest groups are murder and homicide cases (8), disappearance cases (2) and robbery and burglary cases (2).
1 file of the 10 has coverage attached: 1 video, podcast or documentary from 1 creator.
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.
Drink vending machine at Narita Airport — Credit: Chiara CoetzeeCC0Source
200801 Nikko Tosho-gu Nikko Japan04s3 — Credit: 663highlandCC BY-SA 4.0Source
Katsuyama Marines — Credit: U.S. MilitaryPublic domainSource
大分県立芸術文化短期大学正門 — Credit: ちよ氏CC BY-SA 3.0Source
10. By status: 7 unsolved and 3 cold. The count covers published files only and changes as new files clear review.
Shinjuku–Kabukicho Love Hotel murders, from 1981. Open the file
Paraquat murders, with 1 video, podcast or documentary linked from its file. Open the file
Coffeehouse Crime (1 case).
It rebuilds hourly from the published files; the newest file change here is dated Jul 13, 2026. A status changes only when the record behind it does.
