In 1949 after the war, shochus were classified as "group Ko or group Otsu" according to the Liquor Tax Law, but Ko and Otsu were used normally for grading and ranking, therefore it could be misunderstood that "group Otsu" had a lower quality than "group Ko."
戦後1949年の酒税法で「甲類・乙類」の分類呼称が定められたが、通常甲乙の称は等級や順位でも使われる表現であるため、ややもすれば「乙類」が「甲類」に劣ると誤解されかねなかった。