Otoya Yamaguchi

Yamaguchi became a hero and a martyr to the Japanese far-right, and commemorations in his honor continue to this day. Yamaguchi's actions inspired a number of copycat crimes, including the Shimanaka incident in 1961, and inspired Nobel Prize-winning novelist Kenzaburō Ōe's novellas Seventeen and Death of a Political Youth. A photograph of the Asanuma assassination taken by Japanese photojournalist Yasushi Nagao won World Press Photo of the Year for 1960 and the 1961 Pulitzer Prize.

A photograph taken by Yasushi Nagao immediately after Yamaguchi withdrew his sword from Asanuma won the 1961 Pulitzer Prize, and the 1960 World Press Photo award. Footage of the incident was also captured.

Yamaguchi's actions and the massive publicity they received inspired a rash of copycat crimes, as a number of political figures became targets of assassination plots and attempts over the next few years. One of the notable crimes inspired by Yamaguchi's attack was the Shimanaka Incident of February 1961, in which another 17-year-old rightist, Kazutaka Komori, attempted to assassinate the president of Chūō Kōron magazine.

Japanese author Kenzaburō Ōe based his 1961 novellas Seventeen and Death of a Political Youth on Yamaguchi.

Akao was virulently anti-communist and strongly pro-United States. Thus when left-wing protesters, led by Asanuma and the Japan Socialist Party, staged the massive Anpo protests against the 1960 revision of the U.S.-Japan Security Treaty (known as "Anpo" in Japanese), Akao became convinced that Japan was on the verge of a communist revolution and mobilized his followers to stage counter-protests. Yamaguchi participated in these counter-protest activities, and was arrested and released 10 times over the course of 1959 and 1960.

Over the course of his participation in the Anpo protests, Yamaguchi became further radicalized and disillusioned with Akao's leadership, which he felt was not radical enough. On 29 May 1960, as the Anpo protests began to escalate in size and strength, Yamaguchi resigned from Akao's group in order to be free to take more "decisive" action.

On 12 October 1960, Yamaguchi was in the large crowd of 2,500 spectators at a televised election debate held in Hibiya Public Hall in Hibiya Park in central Tokyo, featuring Suehiro Nishio of the Democratic Socialist Party, Inejirō Asanuma of the Japan Socialist Party, and Hayato Ikeda of the Liberal Democratic Party. Asanuma was the second to speak, and took the stage at 3:00 p.m.

On 15 December 1960, just weeks after Yamaguchi's suicide, a nationwide coalition of Japanese right-wing groups held a "National Memorial Service for Our Martyred Brother Yamaguchi Otoya" in the same Hibya Public Hall in Tokyo where Yamaguchi had assassinated Asanuma. Since then, right-wing groups have held an annual commemoration of Yamaguchi's death anniversary each year on 2 November. In October 2010, right-wing groups staged a large-scale celebration of the 50th anniversary of Yamaguchi's assassination of Asanuma in Hibiya Park.

Otoya Yamaguchi (山口 二矢, Yamaguchi Otoya, 22 February 1943 – 2 November 1960) was a Japanese right-wing ultranationalist youth who assassinated Inejirō Asanuma, chairman of the Japan Socialist Party, on 12 October 1960. Yamaguchi rushed the stage and stabbed Asanuma with a wakizashi short sword while Asanuma was participating in a televised election debate at Hibiya Public Hall in Tokyo. Yamaguchi, who was 17 years of age at the time, had been a member of Bin Akao's far-right Greater Japan Patriotic Party, but had resigned earlier that year. After being arrested and interrogated, Yamaguchi committed suicide while in a detention facility.

Yamaguchi was born on 22 February 1943 in Taitō ward, Tokyo. He was the second son of Yamaguchi Shinpei, who by 1960 would become a high-ranking officer in the Japan Self Defense Forces, and was the maternal grandson of the writer Namiroku Murakami, famous for his violent novels glorifying the chivalric code of yakuza gangsters. Yamaguchi grew up in relative privilege, but was radicalized as a teenager by his older brother. At age 16, he joined prominent right-wing ultranationalist Bin Akao's Greater Japan Patriotic Party (日本愛国党, Nihon Aikokutō).