Shinyo was the German liner Scharnhorst, launched in 1934 and trapped at Kure by the outbreak of war in Europe. The Japanese Navy bought her, and after Midway decided to convert her to an escort carrier at the Kure Navy Dockyard, using steel from the cancelled fourth Yamato-class hull. Shinyo was commissioned in November 1943. She served as a convoy escort in the western Pacific for less than a year.
In November 1944, on the way to Singapore, the submarine Spadefish torpedoed her. Up to four torpedoes hit and detonated her aviation fuel tanks, and the explosion destroyed the ship and killed most of her crew. She sank on 17 November 1944.
Sources: Wikipedia (ship articles), the Kure Maritime History Science Museum photograph records on Wikimedia Commons, and combinedfleet.com for the Chitose-class histories. No commanding-officer records were available for these ships.