We ' ve been Westernized since The Meiji restoration. In every country , in every age, multilingualism is a normal part of life. Therefore, an enormous amount of contact is taking place.
Japan is no exception.
A lagoon into which language rivers from all over the world have flowed. Japanese is a delightful and rich melange, a mixture of diverse sounds and shapes. Two multilingual minutes on the Chuo Line. Omoshirokunai, Kami no ke ga dorai ni natchattashi. Not very good.