Leading Japanese casual wear giant, Fast Retailing Co Ltd, on Tuesday posted a 33 per cent plunge in June same-store sales compared to the year-ago period - its ninth consecutive fall in monthly sales. The firm, best known for its value-priced Uniqlo chain, said that plunge was not as steep as its May same-store sales results which fell more than 44 per cent or its results for April when same-store sales fell more than over 42 per cent.