Conversation so far:
What is the cultural background in regards to the 2008 film, Departures?
Japanese funerals are highly ritualized affairs which are generally—though not always—conducted in accordance with Buddhist rites.
Are there any other interesting aspects about the cultural background of the 2008 film, Departures, besides how Japanese funerals are highly ritualized affairs?
Despite the importance of death rituals, in traditional Japanese culture the subject is considered unclean
Why is death considered unclean in traditional Japanese culture?
Despite the importance of death rituals, in traditional Japanese culture the subject is considered unclean as everything related to death is thought to be a source of kegare.

Question: What kinds of rituals?
Self-contained rewrite: What kinds of rituals were performed in Departures?