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The full episode, in writing.
A single shot rang out beneath the heavy winter sky of Tokyo, tearing through silk and muscle and bone, and within minutes, Japan’s most powerful political voice in a generation lay dying on the stone approach to Harakiri Gate. The assassin’s hand still trembled, and his kimono was flecked with blood. Crowds surged forward, boots scraping, voices rising in panic and disbelief. Leaders rushed into the chaos, but the damage was irreversible. On February 26, 1932, Japan’s Prime Minister Inukai Tsuyoshi became the highest-ranking political figure in the country’s modern history to be murdered in cold blood inside his own official residence.
Inukai Tsuyoshi was born in 1855, in the waning years of the Tokugawa shogunate. He grew up in a Japan caught between the rigid feudal system of the samurai and the rapid modernization of the Meiji era. By his twenties, Inukai had begun shaping his reputation as a reformer and a political thinker. He founded the Kokumin Shimbun newspaper in 1890, using its pages to attack entrenched political interests and call for broader representation in government. His writing made him famous, but also placed him in the crosshairs of both rival politicians and a new class of nationalist extremists.
Inukai joined the Rikken Seiyūkai political party in the early 20th century, a group that advocated for parliamentary democracy and a constitutional monarchy. By the 1930s, he was known for his outspoken opposition to military rule and his push for civilian control of government. Japan in 1932 was a powder keg. The global depression had battered the economy. Unemployment soared, and food prices doubled in just a few years. The public’s frustration was compounded by a rising nationalist sentiment, driven by young military officers and secret societies. These groups believed Japan’s survival depended on a return to traditional values and imperial expansion.
On the night of May 15, 1932, a group of eleven young naval officers, joined by several army cadets and right-wing civilians, set out with a single goal: to assassinate the Prime Minister and spark a national revolution. They coordinated their plan over weeks, meeting in secret in the back rooms of Tokyo’s crowded Ginza district. The group called themselves the League of Blood. They believed the only way to purify Japan was to do away with corrupt politicians, foreign influences, and Western-style democracy.
The conspirators first targeted the home of Makino Nobuaki, the Lord Keeper of the Privy Seal. They intended to murder him as a warning to other moderates, but he was not at home. They moved quickly to their second target: Inukai’s official residence, the Sōri Kantei. The officers arrived just after 5 p.m. They were dressed in civilian clothes, but their bearing and clipped haircuts marked them as men of the military. They announced themselves at the gate, claiming to have urgent business. The guards, caught off guard by the presence of so many officers, let them pass. Once inside, the group strode purposefully down the polished corridors to the Prime Minister’s receiving room.
Inukai Tsuyoshi was meeting with his son, Takeru, and a guest. The assassins burst in, brandishing pistols. One of the officers shouted for the others to hold back, then fired twice at point-blank range. The bullets struck Inukai in the chest and abdomen, tearing through arteries and shattering ribs. As the Prime Minister collapsed, his son rushed forward. The assassins turned their pistols on Takeru, but the guns jammed. The officers hesitated for a moment, then fled the room, leaving Inukai bleeding on the tatami mat.
Outside, the assassins regrouped. They fired shots into the air to scatter the building’s staff, then ran out the front gate. Two of the conspirators stole a car and drove directly to the Tokyo Metropolitan Police headquarters. They handed over their pistols and asked to be arrested. The others scattered throughout the city, but almost all were in custody by morning.
Inside the Sōri Kantei, Inukai Tsuyoshi was still alive when an ambulance arrived. Doctors attempted to stabilize him, but his wounds were fatal. He died within an hour.
Word of the assassination spread quickly. Radio broadcasts interrupted regular programming. Newspapers rushed out special editions. Crowds gathered in front of the Kantei, and police cordoned off the area. The killing stunned the nation. No sitting Prime Minister had ever been murdered in the modern era. The attack sent a clear signal: civilian rule was under direct threat from radical elements within the military.
The investigation began immediately. The Tokyo Metropolitan Police assigned their most senior detectives to the case. Chief Inspector Kiyoshige Ogata led the effort, focusing on the connections between the conspirators and several nationalist groups known to advocate violence. The suspects cooperated, giving detailed written confessions and implicating each other in the planning and execution of the crime.
The evidence was overwhelming. The pistols used in the assassination were registered to the Imperial Japanese Navy. Ballistics experts matched bullet casings from the scene to the confiscated weapons. The officers’ uniforms, discovered at their barracks, bore traces of gunpowder and blood. Handwritten notes recovered from several of the men outlined their intent to “remove traitors” and “restore Japan’s honor” by force, referencing both Inukai and Makino by name.
Investigators also uncovered a series of clandestine meetings in Tokyo teahouses, where the conspirators had worked out details of their plot. Witnesses included teahouse servers who remembered seeing the men together, and a cab driver who had dropped them off at the Kantei on the night of the murder. The men’s bank records showed withdrawals for the purchase of weapons and unregistered vehicles.
Despite the strong case, the trial that followed became a national spectacle. The defendants were not tried for simple murder, but for crimes against the state. The trial opened on July 11, 1932, at the Tokyo District Court. The accused officers did not deny their actions. Instead, they used the courtroom to air their grievances against the government, accusing politicians of betraying the emperor and the spirit of bushido. Several high-ranking officers from the navy and army submitted petitions asking for clemency on the grounds that the men had acted out of patriotism.
Public opinion quickly split. Newspaper editorials condemned the murder but also expressed sympathy for the assassins. Thousands of telegrams arrived at the Ministry of Justice, asking for the men to be pardoned. Schoolchildren sent letters supporting the officers’ cause. Several right-wing journals published the conspirators’ courtroom statements in full, treating them as manifestos rather than confessions.
The court handed down sentences in October 1932. The ringleaders received life imprisonment. Several others were given shorter sentences of ten or fifteen years. A handful were acquitted. The verdicts sparked further protests, both from supporters of the assassins and from moderates who felt the punishment was too lenient. Within a decade, most of those convicted were released as part of general amnesties granted during the upheaval of World War II.
The assassination of Inukai Tsuyoshi marked the end of party government in Japan. Within months, the cabinet system was effectively paralyzed, and civilian politicians lost power to military leaders. The Diet, Japan’s national legislature, became a rubber stamp for military policy. By 1936, another attempted coup, the February 26 Incident, would claim the lives of several more political leaders. The violence of 1932 set a precedent: political assassination became a tool for shaping national policy.
The Inukai case was used as justification for increasing police surveillance of political groups and for passing laws that gave the military greater control over civilian institutions. Secret societies, such as the Sakurakai and the Ketsumeidan, multiplied in the years that followed. The boundary between patriotic activism and outright terrorism became blurred in the public mind.
Inukai’s murder exposed deep fractures in Japanese society. The military’s refusal to accept civilian oversight was no longer just a political problem—it was a crisis of national identity. The trial showed how quickly public opinion could turn in favor of violence, especially when justified by appeals to loyalty and tradition.
The assassination also revealed the vulnerability of Japanese democracy to pressure from radical groups. The government’s inability to protect its highest official sent a signal to would-be extremists: violence could succeed where debate and persuasion failed.
Inukai Tsuyoshi’s death forced a generation of Japanese politicians to choose between appeasement and resistance to military authority. In the end, most chose appeasement.
The trial’s transcript ran for more than 2,000 pages, capturing every detail of the conspirators’ planning and the government’s faltering response. The public display of remorse by the assassins—several of whom wept openly during sentencing—became part of their legend. More than 10,000 people lined the streets for Inukai’s funeral, many wearing black armbands and carrying banners denouncing political violence.
The revolver used in the assassination was placed in evidence at the Tokyo Metropolitan Police museum, where it drew thousands of visitors in the years following the crime.
The property records of the Sōri Kantei show that the tatami mat where Inukai fell was replaced within days, but the bloodstain underneath remained visible for more than a year, a silent reminder to all who worked in the building of what had occurred.
The assassination was cited by several contemporary Japanese newspapers as “the end of Taishō democracy,” a reference to the brief period of liberal reform that preceded the rise of militarism.
The League of Blood’s manifesto, recovered from a rented room in Ueno, included a list of more than twenty “enemies of the nation” marked for death, including politicians, bankers, and journalists. Only two of the names were ever crossed off.
A classified police report from June 1932 noted that radical groups had increased their membership by nearly 60 percent in the months after Inukai’s assassination, as young men across the country saw the event as proof of the military’s power to shape history.
The attack inspired a wave of copycat plots throughout the early 1930s, including failed attempts on the lives of business leaders and a prominent Shinto priest.
Records from the Tokyo Metropolitan Police archives show that the investigation into the assassination cost more than 500,000 yen—a sum equivalent to the annual budget of the city’s entire homicide unit at the time.
The only officer to publicly express regret for the murder was Lieutenant Shuichi Sasaki, who, in his confession, wrote, “We did not realize what would come after the shot was fired.”