Thanks Luke. You won't have any issues, the ticket office is up on L39 and they spoke English, it's all quite clear where to go once you're at the distinctive building and signs were also in English. We've travelled quite a bit around Japan on various trips and while English isn't universally spoken everyone was very understanding that we didn't speak more than a few words of Japanese and we always managed to communicate and find our way around even in the small towns where they didn't seem to have as many foreign visitors. In the main cities like Osaka so much is multi-lingual. Have fun!