Crime in Japan is lower than in many other first world countries. While crime is still infrequent, the past decade has seen increasing crime. There are controversies regarding crimes committed by non-ethnic Japanese people and misconduct by police in reporting crime statistics.

The yakuza had existed in Japan well before the 1800s and followed codes similar to the bushido of the samurai. Their early operations were usually close-knit, and the leader and gang members had father-son relationships. Although this traditional arrangement continues to exist, yakuza activities are increasingly replaced by modern types of gangs that depend on force and money as organizing concepts. Nonetheless, yakuza often picture themselves as saviors of traditional Japanese virtues in a postwar society, sometimes forming ties with right-wing groups espousing the same views and attracting dissatisfied youths to their ranks.

Yakuza groups in 1990 were estimated to number more than 3,300 and together contained more than 88,000 members. Although concentrated in the largest urban prefectures, yakuza operate in most cities and often receive protection from highranking officials. After concerted police pressure in the 1960s, smaller gangs either disappeared or began to consolidate in syndicate-type organizations. In 1990, three large syndicates (Yamaguchi-gumi, Sumiyoshi-kai, Inagawa-kai) dominated organized crime in the nation and controlled more than 1,600 gangs and 42,000 gangsters. Their number have since swelled and shrunk, often coinciding with economic conditions.

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Japan ⁱ/dʒəˈpæn/ (Japanese: 日本 Nihon or Nippon; formally 日本国  Nippon-koku or Nihon-koku, literally the State of Japan) is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south. The characters that make up Japan's name mean "sun-origin", which is why Japan is sometimes referred to as the "Land of the Rising Sun".

Japan is an archipelago of 6,852 islands. The four largest islands are Honshū, Hokkaidō, Kyūshū and Shikoku, together accounting for ninety-seven percent of Japan's land area. Japan has the world's tenth-largest population, with over 127 million people. The Greater Tokyo Area, which includes the de facto capital city of Tokyo and several surrounding prefectures, is the largest metropolitan area in the world, with over 30 million residents.

Archaeological research indicates that people lived in Japan as early as the Upper Paleolithic period. The first written mention of Japan is in Chinese history texts from the 1st century AD. Influence from other nations followed by long periods of isolation has characterized Japan's history. In the late 19th and early 20th centuries, victory in the First Sino-Japanese War, the Russo-Japanese War and World War I allowed Japan to expand its empire during a period of increasing militarism. The Second Sino-Japanese War of 1937 expanded into part of World War II in 1941, which came to an end in 1945 following the atomic bombings of Hiroshima and Nagasaki. Since adopting its revised constitution in 1947, Japan has maintained a unitary constitutional monarchy with an emperor and an elected parliament called the Diet.