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On 19 August 1945, the Home Ministry ordered local government offices to establish a prostitution service for Allied soldiers to preserve the "purity" of the Japanese race.
This prostitution system was similar to the comfort system, because the Japanese police force was responsible for mobilizing the women to serve in these stations similarly to the way that Japanese Military during the Pacific War mobilized women.
Their way of living is regulated by very strict rules concerning behavior and this includes sex.
states that "No person may either do prostitution or become the customer of it," but no judicial penalty is defined for this act.
A law was passed that required prostitutes to register and work in secured facilities, its main purpose being for tax collection.
The districts were walled and guarded for taxation and access control.
Rōnin, masterless samurai, were not allowed in and neither were the prostitutes let out, except to visit dying relatives and, once a year, for hanami (viewing cherry blossoms).
Kabukicho, an entertainment and red-light district in Shinjuku, Tokyo, measures only 0.34 km According to National Police Agency records, out of 50 non-Japanese people arrested for prostitution offences (売春防止法違反) in 2013, 31 (62%) were mainland Chinese, 13 (26%) were Koreans and 4 (8%) were Thai.
In Tokyo, prostitution dates back several hundred years.