Angel Guts: Red Porno (1981)

Nami works in a department store. She is asked to stand in for a friend in a magazine photo-shoot, which turns out to be for an S&M magazine called "Red Porno". When the photos are published, she is sacked and her lover abandons her. Muraki, who is an unpopular otaku loner, tries to meet up with Nami but is shot by a woman who takes him for a rapist and dies.