Shisaka was a Japanese Hiburi-class coastal defense ship. Laid down on August 21, 1944, at the Sakurajima shipyard, it was launched on October 31 and commissioned on December 15. The ship was named after Shisaka Island in Ehime Prefecture. It did not play an active role in the war and was decommissioned in the port of Yokosuka. Following the country's surrender, the ship was used to demobilize and transport soldiers back to Japan. On July 6, 1947, the ship was transferred to the Republic of China as reparations and renamed Huian. On April 23, 1949, the ship defected to Communist China. It was sunk by an enemy aircraft on April 28 but was raised from the water and repaired by December 24, 1953. In 1961, it was renamed Ruijin. In 1982, it was reclassified as a training ship. It was decommissioned and scrapped in 1990.

Shisaka was introduced as a reward for the 2025 "Naples of the East" event. Similar to its sister ship, Syonan, it has a powerful anti-aircraft battery and good survivability. This allows it to effectively combat both enemy aircraft and surface forces in close combat. One of its drawbacks is its relatively low speed. Unlike the Syonan, it has additional armor shields for some of its air defense systems.