Japanese female ghost stories have heavy foreign influence, being influenced by Western movies and spiritualism and Chinese ghost stories. With this foreign influence, are female Japanese ghost stories "truly" Japanese? Can something said to authentically from a culture?

yes

Explanation:

the answer is counterpoint.

counterpoint definition: "the art or technique of playing a melody or melodies in conjunction with another, according to fixed rules."

counterpoint is present in a lot of baroque music- such as bach (notably his wtc prelude and fugues) and scarlatti, but can also be found in music by mozart, beethoven. it can even be found in music as modern as john williams!