Yamataian Ministry of National Security

The Ministry of National Security is a ministry of the Government of Yamatai responsible for counter-intelligence, foreign intelligence, counter-terrorism, border enforcement and immigration. It is housed in the Aramaki Daisuke Building in Heian, which is also the headquarters of its subordinate agency, the Imperial Security Agency.

The Ministry of National Security was founded on 5 January 1957, after the preceding Ministry of Home Affairs was split into two agencies, the Ministry of National Security and the Ministry of Public Safety. The primary mission of the Ministry of National Security at its time of inception was the elimination and prevention of communist infiltration, as well as countering Arshavati intelligence efforts and carrying out espionage on Arshavat and Hinomoto.

Since 2018, the Minister for National Security has been Shimizu Ryō. Under the Ministry of National Security are the ISA as well as the Immigration and Checkpoints Authority.

The National Intelligence Law of 1976 granted the Ministry of National Security broad powers to conduct many types of espionage both domestically and abroad, as well as the power to administratively detain threats to national security for up to 15 days. These were primarily to address concerns that the ongoing Hinomoto Insurrection was being influenced by Arshavati infiltrators. By extension both the ISA and ICA are empowered with these abilities as well.