The Japanese song you want is the theme song of Spirited Away, and the song is called Spirited Away: The Ending of Time. This was the theme song of the Japanese animated film," Spirited Away," produced by the Japanese animation production company A-1 Pictures. The song was composed by Japanese musician Hayao Miyazaki and sung by Japanese female singer Lee Takahashi. The song was very popular in Japanese animated films and dramas, and was considered one of the classic Japanese anime songs.
It was common for Chinese songs to be covered into Japanese songs. Some classic songs were covered into Japanese versions, such as "Blue and White Porcelain" and "Little Lucky". This situation usually led to copyright issues because the singer of the cover version might not have obtained the copyright of the original song. However, in some cases, the copyright owner of the original song may agree to the cover singer using the song and pay a certain fee under certain conditions.