A 19-year-old newspaper delivery boy begins collecting information on the households in his neighborhood and keeping a journal of why he doesn't like them. Declaring himself a 'right-winger' and calling in bomb threats against the neighbors he doesn't like, the 19-year-old begins a war of psychological terror against the families in his neighborhood.

1970s Japan saw the rise of biker gangs, known as Bōsōzoku, which drew the interest of the media. God Speed You! Black Emperor follows a member of the bike gang and his interaction with his parents, after he gets in trouble with the police.