Listen Heart Sutra （般若心経）!!
Heart Sutra is origin from India, but we Japanese also vary familiar with it. Because Heart Sutra is not based on schools of Buddhism.
Anyway listen it!!
Beside of Heart Sutra, the movie introduce Japanese grave. Basically Japanese will be cremated when passed away, then below each gravestone, just bone is there.
A lot of Japanese go grave several time per a year for Haka-mairi, means “visiting ancestor’s grave”.