What language does the movie "Lost in Translation" focus on?

Set in Tokyo, the movie's primary language focus is Japanese. Bill Murray plays Bob Harris, an aging American actor brought to Japan to film a commercial. Scarlett Johansson portrays Charlotte, a young woman accompanying her husband on a business trip. Both characters grapple with the unfamiliarity of Japanese culture, and their inability to understand and communicate in the language adds to their feelings of isolation.