Actually, if you read the "user comments" for "Nankyoku monogatari", many of them saw this when they were 10 or 11 and it affected them greatly. Read their comments and decide if you want to show them. There is no on-screen death, but you know what happens and it's the skill of the filmmakers that delivers the message.

http://www.imdb.com/title/tt0085991/usercomments