HOYEISAN (later HOEISAN) MARU and sisters HORAISAN, KAISHO, KAIYEI, TAIHO and TAIYU MARUs were completed 1917~1918. HORAISAN, KAIYEI and TAIYU MARUs
were lost prewar. In 1938, HOEISAN MARU was first requisitioned by the Imperial Army (IJA) as a troop transport and saw service in the invasion of the Philippines. In 1943, HOYEISAN MARU was torpedoed by an
American submarine and beached. At an unknown date, she was refloated and converted to a floating AA battery at Manila. In Oct '44, she was sunk by Task Force 38ís carrier aircraft in Manila Harbor.