Completed in 1938, TATSUMIYA MARU was built as a 6,345-ton cargo ship. She carried bananas, rice, sugar, fruit and vegetables between Formosa and mainland Japan for over two years. TATSUHARU MARU was completed in '39 and was also used on Tatsuuma Kisen's Kobe-Formosa route. In the summer of '41, both TATSUMIYA and TATSUHARU MARUs were requisitioned by the IJN and began conversion to minelayers. In late '42, both were reconverted to auxiliary transports. They both survived the war. TATSUMIYA MARU was scrapped in '67 and TATSUHARU MARU was scrapped in '70.