May 15 incident

The Prime Minister's Official Residence is the official workplace and residence of the Prime Minister of Japan. It is commonly referred to as Sōri Daijin Kantei (総理大臣官邸), Shushō Kantei (首相官邸), or simply Kantei (官邸). Located at 2-3-1 Nagata-chō, Chiyoda-ku, Tokyo 100–8968, it is diagonally adjacent to the National Diet Building.The term Kantei is used as a metonym for the office of the Prime Minister of Japan and for the Prime Minister's advisors and administration in general. In addition to being the principal office and residence of the Prime Minister, the building also serves as the principal office of the Chief Cabinet Secretary and their Deputy, the location of Cabinet meetings, and is also the location of a national crisis management center.

The Cabinet Office (内閣府, Naikaku-fu) (CAO) is an agency of the Cabinet of Japan. It is responsible for handling the day-to-day affairs of the Cabinet. The Cabinet Office is formally headed by the Prime Minister.

The Cabinet Secretariat (内閣官房, Naikaku-kanbō) is an agency in the Japanese government, headed by the Chief Cabinet Secretary. It organizes the Cabinet's public relations, coordinates ministries and agencies, collects intelligence, and organizes miscellaneous other tasks for the Cabinet, including the Prime Minister's office (Kantei) and residence (Kōtei).

The Imperial College of Engineering (工部大学校, Kōbudaigakkō) was a Japanese institution of higher education that was founded during the Meiji Era. The college was established under the auspices of the Ministry of Public Works for the training of young Japanese engineers. Supporting Japan’s rapid industrialization at the end of the 19th century, the college commenced teaching in October 1873 soon after the initial cohort of teaching staff arrived from United Kingdom. The college was an immediate precursor to the establishment of the University of Tokyo’s Faculty of Engineering in 1877.

Kokkai-gijidomae Station (国会議事堂前駅, Kokkai-gijidō-mae-eki) is a subway station in Chiyoda, Tokyo, Japan, operated by the Tokyo subway operator Tokyo Metro. It is located adjacent to the National Diet Building. The station name literally means "in front of the National Diet Building".

Tameike-sannō Station (溜池山王駅, Tameike-Sannō-eki) is a subway station in Tokyo, Japan, operated by the Tokyo subway operator Tokyo Metro. It is located in the ward of Chiyoda (Namboku Line platform) and Minato (Ginza Line platform).

The Japan Patent Office (特許庁, Tokkyochō, JPO) is a Japanese governmental agency in charge of industrial property right affairs, under the Ministry of Economy, Trade and Industry. The Japan Patent Office is located in Kasumigaseki, Chiyoda, Tokyo and is one of the world's largest patent offices. The Japan Patent Office's mission is to promote the growth of the Japanese economy and industry by administering the laws relating to patents, utility models, designs, and trademarks. (Copyright affairs are administered by the Agency for Cultural Affairs.)

The Nippon Taiko Foundation (日本太鼓財団, Nippon taiko zaidan), formerly referred to as Nippon taiko renmei (日本太鼓連盟)　is a Japanese governmental organization and is the largest national organization of taiko performance groups active in Japan. As of 2012, the Foundation represents over 800 taiko groups, approximately 20,000 individuals, and is made up of 34 leagues corresponding to some Japanese prefectures.

The House of Representatives (衆議院, Shūgiin) is the lower house of the National Diet of Japan. The House of Councillors is the upper house. The composition of the House is established by Article 41 (ja) and Article 42 (ja) of the Constitution of Japan. The House of Representatives has 465 members, elected for a four-year term. Of these, 176 members are elected from 11 multi-member constituencies by a party-list system of proportional representation, and 289 are elected from single-member constituencies. 233 seats are required for a majority. The overall voting system used to elect the House of Representatives is a parallel system, a form of semi-proportional representation. Under a parallel system the allocation of list seats does not take into account the outcome in the single seat constituencies. Therefore, the overall allocation of seats in the House of Representatives is not proportional, to the advantage of larger parties. In contrast, in bodies such as the German Bundestag or the New Zealand Parliament the election of single-seat members and party list members is linked, so that the overall result respects proportional representation fully or to some degree.The House of Representatives is the more powerful of the two houses, able to override vetoes on bills imposed by the House of Councillors with a two-thirds majority.The last election for the House of Representatives was held on 31 October 2021 in which the Liberal Democratic Party won a majority government with 261 seats. Along with their coalition partner, Komeito, which won 32 seats, the governing coalition holds 293 seats in total.

The National Diet Building (国会議事堂, Kokkai-gijidō) is the building where both houses of the National Diet of Japan meet. It is located at Nagatachō 1-chome 7–1, Chiyoda, Tokyo. Sessions of the House of Representatives take place in the left wing and sessions of the House of Councillors in the right wing. The Diet Building was completed in 1936 and is constructed out of purely Japanese materials, with the exception of the stained glass, door locks, and pneumatic tube system.

The National Diet (Japanese: 国会, Hepburn: Kokkai) is Japan's bicameral legislature. It is composed of a lower house, called the House of Representatives (衆議院, Shūgiin), and an upper house, the House of Councillors (参議院, Sangiin). Both houses are directly elected under a parallel voting system. In addition to passing laws, the Diet is formally responsible for selecting the Prime Minister. The Diet was first convened as the Imperial Diet in 1890 under the Meiji Constitution, and took its current form in 1947 upon the adoption of the post-war constitution. Both houses meet in the National Diet Building (国会議事堂, Kokkai-gijidō) in Nagatachō, Chiyoda, Tokyo.

The Sanno Park Tower (山王パークタワー, Sannō Pāku Tawā) is a 44-story skyscraper located in Nagatachō, Tokyo, Japan. It is the 8th highest building of the ward, after the Shin-Marunouchi Building, JP Tower, GranTokyo, etc. The building stands over Tameike-Sannō Station which is served by the Tokyo Metro Ginza Line (G06), Tokyo Metro Namboku Line (N06) and linked to Kokkai-gijidō-mae Station (M14) on the Tokyo Metro Marunouchi Line.