Japan's Tao Okamoto and Belgian-French performer Virginie Efira won the best actress award at the Cannes Film Festival on Saturday, with Okamoto becoming the first Japanese actress to receive the recognition.They both starred in the film "All of a Sudden," or "Soudain" in French, directed by Oscar-winning Ryusuke Hamaguchi. The film depicts a theater director battling cancer, played by Okamoto, and a care facility director, played by Efira, who form a deep friendship.The movie, set to premier in Japan on June 19, is based on a book of letters about illness and death exchanged between a phil…READ FULL ARTICLE