百年の時効

百年の時効

ひゃくねんのじこう
Details
Author 伏尾美紀 (ふしお みき) · Miki Fushio
Language Japanese
Format Novel
Published 2025
Pages 548
Read 2026-07-21 → 2026-07-27
Finished

Review

百年の時効 was absolutely amazing, it’s such a great police procedural and so well written, so well documented and so engrossing all along.
The novel really shines with its setting, it spawns three eras, Showa, Heisei and Reiwa, and we follow four police detectives working on the same case: the brutal killing of a family that took place in 1974.
The novel is a real exploration of Japan’s society, politics and economical landscape of the second half of the 20th Century, everything felt very real and very documented. Real criminal cases, persons and major events that completely shook Japanese society are present in the novel, but what I really loved is that they also affect our plot and our fictional characters, even sometimes dramatically, so the story felt very real and anchored in reality. Many times I had the feeling that I was reading romanised true crime and had to remind me that it was fiction… that’s how real it all felt.
The police detectives we follow are also all very different, influenced by their generation, their background, the era in which they grew up. It’s also true for the way investigations are conducted, from the time when the police actually cooperated with criminal organisations, to the developments in psychology or forensics. I personally found this aspect of the novel very interesting, it sometimes gave me Mindhunter vibes!
Not only does the novel spawns decades, but the plot is also closely linked to Japanese history: the setting is not just a setting, it influences the plot, so we travel through these eras while investigating the case. I really loved it, the author really managed to keep the novel engrossing, with a really good pace all along. It never felt like the case was a pretext to depict Showa society or something like that, the plot really stays central all along and it was impossible to put the book down.
The novel is really a solid police procedural, but it also borrows from other genres, sometimes feeling like a financial thriller, sometimes like a shakai-ha mystery depicting societal corruption and the connections between politicians, banks, yakuza and the police, sometimes like a honkaku mystery (the end in particular felt like the big reveal of detective novels).
The plot is very complex, there are a lot of ramifications and it’s important to have a clear vision of the characters’ relationships and what happened when. Even though I read it everyday until I finished it, I still had to take some notes to remember important facts or how characters were linked.
There is not a single thing I didn’t like, I find 百年の時効 really impressive, I really hope it gets translated into English!


Updates

100%

I finished it! The end was so… both amazing and unexpected, it felt like reading a honkaku mystery all of a sudden, I was not anticipating that! I thought that the mystery was solved already, and it was just a matter of finding enough evidence, but the end still manages to surprise the reader.

83%

I finished the Heisei chapter! I didn’t think the plot could get more complex than it already was, but it did! The roots and ramifications of the case go much deeper than it looks at first, this book is really impressive.

74%

Not reading as much as I would like today, but I do want to read this book every day if possible, because the plot is so complex, I’m afraid I will forget details. Writing this book must have required a lot of research and work, it’s crazy how good it is. I’m 3/4 into it, and the book has been extremely engrossing all along.

65%

I was afraid that after the Showa chapter, the story would lose its pace and suspense, but the Heisei chapter is as good as the previous one!

53%

I finished the Showa chapter, it was so good, it could have been a novel in itself! But I’m only halfway through!

43%

The investigation is so so great, I’m really enjoying this novel. I’m still in the Showa chapter, I don’t know how long each chapter is.
The number of characters is well above average, I like novels that have such a density of information, where even peripheral characters are named, it makes everything feek more real.
The plot is also more and more complex, I really think it’s best for me to focus entirely on this book until I finish it. I feel like it would be easy to forget key elements if I read several things at the same time or leave the book untouched for some days.

24%

I’ve been very tired today, so couldn’t progress as much as I wanted, but wow, this novel is really great. It’s very well written, you can immediately tell that you’re in the Showa chapter compared to the Reiwa opening one.

Chapter 2 reminds me of 夜の終わる時 (1963) by Shoji Yuki. I find that the author really managed to give a good depiction of the time while still keeping the investigation engrossing. It now feels like the case is going to be much more huge than what it seems at first.

10%

I started 百年の時効 and finished the first chapter. This book is incredibly engrossing! The first chapter was taking place nowadays, but it also settled the differences between the eras, how mentalities and practices changed, like for example how investigation are conducted now compared to the 70s, or the differences in means available to the police. It also mentions several real cases that all have an importance in Japanese recent history, so reading this novel is also an opportunity for me to learn about all these events.

I spent a lot of time reading about several of the real cases mentioned, so I haven’t made much progress on the reading itself, but the beginning is fantastic and the plot looks really great.

Post

仕手

仕手 (して)
My dictionary only gives the meanings “operator”, “speculator” for this word, but as stated in the novel, it means speculators who pool funds to manipulate stock prices and artificially influence the market.

頂上作戦

頂上作戦 (ちょうじょうさくせん) are major police crackdowns targeting yakuza leaders to dismantle their organisations.
シノギ is slang for yakuza income activities/sources.

The old western-style buildings of Hakodate branches of banks like the Bank of Japan or Yasuda Bank are in the financial district, together with the Fugaku Bank, though this one is of course fictional.
I like how the author constantly integrates real facts and events to the fiction, it makes the story feel very real and anchored in its period.

五稜郭

五稜郭 (ごりょうかく)- Goryōkaku
A star shaped fort in Hakodate where took place the 箱館戦争 (はこだてせんそう) Battle of Hakodate.
So the name of the city Hakodate changed at some point (apparently in 1869) from 箱館 to 函館.

ウーマン・リブ

ウーマン・リブ is short for Women’s Liberation, apparently the term was first used by Asahi in 1970.

ゴジラ対メカゴジラ

ゴジラ対メカゴジラ released in 1974 and was the 14th film of the franchise.
I’m not even 100% sure, but I think I saw one Godzilla movie once? Maybe I should try to watch at least one or two movies from the franchise…

Hiroo Onoda

Hiroo Onoda is known for continuing fighting after the end of WWII, because he didn’t believe Japan had surrendered and thought news announcing the end of the war were ennemy propaganda. Initially with three other men then alone, he continued a guerrilla warfare for 29 years in the Philippines. A Major had to go to the Philippines to officially relieve him of his duties in 1974. He returned to Japan in March of this year and was the center of media’s attention. Some considered him a hero even though he probably killed many civilians during all these years.

Shoichi Yokoi has a similar fate, staying hidden on Guam for 28 years after the end of the war. He didn’t believe the war was over and stayed in the jungle with other comrades, then alone. He didn’t want to surrender and return alive to Japan.

At the time of rapid economic growth, after the Olympics and the Osaka Expo, it’s easy to imagine that the reappearance of these soldiers who continue fighting for nearly 30 years and thought returning alive to Japan was a disgrace must have been a shock to most people.

Shibuya riot case

渋谷暴動事件: Shibuya Riot Case
The Shibuya riot case was a famous incident involving the New-left radical activists in 1971. In November, left-wing students and workers organised protests, but some members of a far-left group called 中核派 violently killed a 21-year-old police officer, beating him with iron pipe and setting him on fire with molotov cocktails.
7 members were identified as the ones who killed the policeman, 6 were arrested and prosecuted, but Masaaki Osaka (大坂正明) remained a fugitive for 46 years with the help of the 中核派.
Even though the status of limitation was 15 years at the time, it is suspended while accomplices are on trial. Numerous and lengthy appeals made it so that these trials were dragged out, so the status of limitation for Osaka was paused and was not concluded in 2010, when the whole system was abolished in the case of murder and took place retroactively for cases that were still open in 2010. This is what allowed Osaka to be trialed in 2017 when he was finally arrested.

Sakuradamon

I didn’t know that, but apparently, the Tokyo Metropolitan Police Department is often referred to as Sakuradamon 桜田門 because the main building is facing the Sakurada Gate of the Imperial Palace. This gate is also where the Sakuradamon Incident took place as mentioned in the novel (it was the assassination of Ii Naosuke, a Tairō of the Tokugawa Shogunate).
But as the novel states, the Metropolitan Police Department HQ were originally located elsewhere and only moved there in 1931, because their previous building had been destroyed during the 1923 Great Kantō Earthquake.

三億円事件

三億円事件 - 300 million yen robbery
The 三億円事件 took place in 1968, it is the biggest heist in Japanese history and remains unsolved. A man, posing as a policeman, managed to fool bank employees who were transporting money. He made them believe that a bomb was hidden under the vehicle. The employees believed it because a few days earlier, the bank had received threats involving explosion. The man was able to drive away with the vehicle after scaring the employees away.
The scale of the investigation was massive, and they did check a ton of fingerprints one by one. A 19-year-old man was falsely accused and committed suicide. In 1975, the case reached its status of limitations.
Official name of the case is 現金輸送車強奪事件, but it is commonly referred to as 三億円事件.

10.000 yen banknotes

Prince Shōtoku (聖徳太子) was printed on the 10.000 yen banknotes when they first released in 1958, but the second series printed in 1984 had the portrait of Fukuzawa Yukichi (a Meiji philosopher) instead.

相場師

Apparently, the word 相場師 is not super familiar to Fujimori, so I guess it’s more a Showa thing. I understand it as a market wizard who trades following a mix of instinct and skill, and can make a fortune quickly. Some of these speculators have become some kind of legends, which seems to be the case for Sakurai.
I don’t know if the word itself is used a lot nowadays, investors are generally referred to as 投資家 or トレーダー.

Lockheed bribery scandals

ロッキード事件 - Lockheed bribery scandals
Lockheed is a US aerospace company that paid bribes to politicians of several countries to facilitate the sell of their aircraft. Japan was one of the countries involved,
Lockheed actually hired Yoshio Kodama, a right-wing ultranationalist, prominent figure in the organised crime and active in the criminal underworld from the 30s to the 70s, to influence Japanese airlines, notably All Nippon Airways, to buy one of Lockheed’s aircraft. They also paid considerable sums to the office of Prime Minister Kakuei Tanaka to facilitate the contrat. Kodama, Tanaka and All Nippon Airways all receive bribes.
Lockheed used Nicholas Deak, a banker and head of a huge financial group who worked with US secret service, to transfer the money to Japan via HK where Deak’s office was. This and other scandals will eventually force Deak to declare bankruptcy in 1984.
In 1976, actor Mitsuyasu Maeno who was associated with the Japanese ultranationalist movement tried to kill Kodama by crashing his plane on Kodama’s house. He used to respect Kodama, but considers that he betrayed the right-wing and the samurai code by accepting bribes, and caused a national disgrace (Lockheed had built aircrafts that fought against Japan in WWII).
Maeno and two of his friends rented two planes saying it was for the shooting of a film on kamikaze. Maeno then alone crashed his plane on Kodama’s house, killing two servants and himself in the process. Kodama, who was in another part of the house, was uninjured. He later died of a stroke in 1984 before his trial was concluded.
As for Tanaka, he was arrested on 1976 but released on bond, he was later sentenced to four years of prison in 1983 but remained free on appeal until his death. His political influence did not end with the scandal however and he was able to continue his political career with the support of his faction. The scandal did create a political turmoil and Prime Minister dissolved the Diet, but in the 1983 Japanese general election (also called the Lockheed Election - ロッキード選挙), Tanaka retained his seat at the Diet.

Characters

第四章: 令和編 二〇二四昭和九十九年 · 4
造之 Other
ひろゆきHiroyuki
Ōsaka’s first name
逢坂 Other
おおさかOsaka
Kihara’s secretary
伊達順之助 Other
だて じゅんのすけDate Junnosuke
1892–1948, bandit who participated in several political schemes in China.
静子 Other
しずこShizuko
Heihachi’s daughter
小和田平八 Other
おわだ へいはちOwada Heihachi
ex-member of 満州国家敬神団体
啓介 Other
けいすけKeisuke
Kojima’s father and member of the 満州国家敬神団体
娶り Other
めとり
Heihachi’s mother
元彦 Other
もとひこMotohiko
From the Katsuragi family, was financially supporting the 満州国家敬神団体
聡子 Other
さとこSatoko
Kusaka’s daughter
村井秀夫 Other
むらい ひでおMurai Hideo
High member of the Aum cult
竹田 Other
たけだTakeda
Kin Terauchi’s married name
春日 Other
かすがKasuga
Secretary at 満鉄同友会
国松孝次 Other
くにまつ たかじKunimatsu Takaji
Commissioner General of the National Police Agency from 1994 to 1977
本田次郎 Other
ほんだ じろうHonda Jiro
Rended the apartment next to Kojima’s lover
小林素子 Other
こばやし もとこKobayashi Motoko
Employee at Tokyo National Company

太田信三 (おおたしんぞう) is a former leader of a yakuza group affiliated to Isokawa-kai. He appeared several times before, but checking my list, it looks like I forgot to add it on first appearance.

里村 Other
さとむらSatomura
Point of contact for the Special Investigation HQ
座間 Other
ざまZama
Liaison investigator from Division 4.
澤田智也 Other
さわだ ともやSawada Tomoya
Kusaka’s friend at school
麻原彰晃 Other
あさはら しょうこうAsahara Shoko
Leader of the Aum cult who orchestrated the sarin gas attack in 1995
相馬 Other
そうまSoma
from 神奈川県警捜査一課
佐野源次 Other
さの げんじSano Genji
runs a construction firm, from the same orphanage
美空ひばり Other
みそら ひばりMisora Hibari
1937-1989, singer and actress.
宮﨑勤 Other
みやざき つとむMiyazaki Tsutomu
Serial killer who murdered four young girls between 1988 and 1989

I tried to remember if I knew any song by Hibari Misora, but I don’t think so… my knowledge of 20th century Japanese music is close to zero.

佳也子 Other
かやこKayako
Kusaka’s wife
大舘重樹 Other
おおだて しげきOdate Shigeki
Fugaku Bank employee who owns a Bluebird
佐伯林蔵 Other
さえき りんぞうSaeki Rinzo
Director of the institution (orphanage)
恭介 Other
きょうすけKyosuke
Saeki’s son
工藤恒夫 Other
くどう つねおKudo Tsuneo
From Yokosuka City Wellfare Department, currently runs the institution.
神谷保 Other
かみや たもつKamiya Tamotsu
5, child from the orphanage.
梅津 Other
うめづUmetsu
employee at the orphanage.
都築時子 Other
つづき ときこTsuzuki Tokiko
Kokonoe’s wife
都築直次 Other
つづき なおつぐTsuzuki Naotsugu
Tokiko’s relative.
成一 Other
せいいちSeiichi
Tokiko’s son
松永 Other
まつながMatsunaga
Seiichi’s adoptive parents
Other
きよしKiyoshi
Name of Matsunaga
笛子 Other
ふえこFueko
Kiyoshi’s wife
和夫 Other
かずおKazuo
Kiyoshi and Fueko’s son
松崎ひかる Other
まつざき ひかるMatsuzaki Hikaru
Idol
土方歳三 Other
ひじかた としぞうHijikata Toshizo
Served the Tokugawa Shogunate as vice-commander and thought during the Boshin War, he died at the Battle of Hakodate.
末松義男 Other
すえまつ よしおSuematsu Yoshio
Ex-journalist for the 函館日報.
寺内きん Other
てらうち きんTerauchi Kin
maid working for the Tagami
真千子 Other
まちこMachiko
Oldest daughter of the Tagami
真也 Other
しんやShinya
Son of the Tagami
水沢 Other
みずさわMizusawa
Yakuza family operating in Hakodate in the 50s
加山ひな子 Other
かやま ひなこKayama Hinako
Employee at the Hakodate branch of Fugaku bank at the time of the case.
葛城 Other
かつらぎKatsuragi
Founder of the Fugaku Bank
Other
たけしTakeshi
Hinako’s husband
田上寛一 Other
たがみ かんいちTagami Kanichi
Director of the Hakodate branch of the Fugaku Bank.
知子 Other
ともこTomoko
Tagami’s wife
九重徳次郎 Other
ここのえ とくじろうKokonoe Tokujiro
預金係長 of the Hakodate branch.
鶴見 Other
つるみTsurumi
From the Kojima group
甲本鉄平 Other
こうもと てっぺいKomoto Teppei
Apprentice cook
遠藤ノブ Other
えんどう のぶEndo Nobu
Masae’s mother
初美 Other
はつみHatsumi
Masae’s childhood friend
門真 Other
かどまKadoma
Masae’s first husband
金井 Other
かないKanai
Director of the metal trading company where Masae worked
輝樹 Other
てるきTeruki
Masae and Kadoma’s son
市田 Other
はばたHabata
Chief of Yakuza group affiliated to Isokawa-kai
Other
まさるMasaru
Kanai’s first name
児島玲人 Other
こじま あきとKojima Akito
Leader of the Kohima group, also affiliated with the Isokawa-kai
常盤みね子 Other
ときわ みねこTokiwa Mineko
Salesperson for Rosemary Cosmetics
細木 Other
ほそきHosoki
Investigator from the First Division
吉川澄一 Other
よしかわ ちょういちYoshikawa Choichi
1886-1955 Head of the Forensic Identification Division at the TMPD

Yoshikawa Chōichi is famous for defining the forensic evidence known as Yoshikawa Line. He was a pioneer of modern Japanese forensic investigation and criminal identification. His notes posthumously published under the title 刑事鑑識 have become a reference text for forensic investigators (in 1974, Yuasa still refers to it.)

牧野 Other
まきのMakino
Yuasa’s colleague at Tsukishima (月島) police station
小野田寛郎 Other
おのだ ひろおOnoda Hiroo
Second Lieutenant in the Imperial Japanese Army during WWII
横井庄一 Other
よこい しょういちYokoi Shoichi
Sergeant in the Imperial Japanese Army during WWII
小室 Other
こむろKomuro
巡査長, was sent to secure the scene.
須黒武光 Other
すぐろ たけみつSuguro Takemitsu
Ryoichi’s father
昌枝 Other
まさえMasae
Ryoichi’s mother
島貫 Other
しまぬきShimanuki
Yuasa’s colleague and senior.
井伊直弼 Other
いい なおすけIi Naosuke
was a Tairo during the Tokugawa Shogunate
草加文夫 Other
くさか ふみおKusaka Fumio
警視庁刑事部捜査一課管理官

警視庁刑事部捜査一課管理官: Investigation Commander, First Criminal Investigation Division, Criminal Investigation Department, Tokyo Metropolitan Police Department.

藤森菜摘 Other
ふじもり なつみFujimori Natsumi
28, police officer at Katsushika (葛飾) police station. 刑事組織犯罪対策課.
桜井信五 Other
さくらい しんごSakurai Shingo
74, died in his rented apartment.
木原則夫 Other
きはら のりおKihara Norio
guarantor on Sakurai renting contract, had a high position at 富岳 bank.
石原莞爾 Other
いしはら かんじIshihara Kanji
Kanji Ishiwara, general in the Imperial Army in WWII and author 世界最終戦論.
須黒 Other
すぐろSuguro
Ryoichi’s family name
八田 Other
はったHatta
Name of a law firm
荒岩 Other
あらいわAraiwa
Fujimori’s chief
  • The 組織犯罪対策部/課 (Organised Crime Investigation Division) is mainly dealing with organised crime, firearms and drugs, etc.
  • The Fugaku Bank (富岳銀行) has now become 新緑銀行.
  • 世界最終戦論 military strategy and geopolitical doctrine, notably predicted the consolidation of two major blocks: the Western block led by the US, and the Eastern block led by Japan,
湯浅卓哉 Other
ゆあさ たくやYuasa Takuya
Ex-police officer, 10 year younger than Kamata
鎌田幸三 Other
かまた こうぞうKamata Kozo
died at 88, used to be Yuasa’s senior.
京子 Other
きょうこKyoko
Yuasa’s wife
田中角栄 Other
たなか かくえいTanaka Kakuei
Prime Minister at the time of the Lockheed Bribery scandal
美代子 Other
みよこMiyoko
Narrator’s big sister, 11
良一 Other
りょういちRyoichi
Narrator, 7

Quotes

世の中、一番あくどいのはヤクザより銀行さんかもな

— 鶴見

Vocabulary

第二章:昭和編 一九七四 昭和四十九年
WordReadingDefinition
真鍮 しんちゅう brass
古株 ふるかぶ old-timer; veteran; senior
手練れ てだれ mastery; skillfulness; dexterity
刃こぼれ はこぼれ nick in a blade (sword, knife); chip in a blade
袈裟斬り けさぎり slashing (someone) with a sword diagonally from the shoulder down to the waist

袈裟斬り’s name comes from a Buddhist monk’s stole 袈裟 and the way it hangs across the chest.

第一章:令和編 二〇二四令和六年
WordReadingDefinition
相場師 そうばし master trader, stock speculator
異端児 いたんじ nonconformist, maverick, rebel, enfant terrible
兜町 あぶとちょう Kabutochō, location of Tokyo Stock Exchange.
徒花 あだばな enterprise or plan, etc. that comes to nothing, ephemeral bloom, something that doesn’t last