Angel Guts: Red Porno (1981)

The rain of solitude and sensuality moistens men and women.

Nami is a department store worker who agrees to stand in for a friend in a magazine photo shoot. To her horror it turns out to be for an S&M magazine and she is forced to pose for degrading photos. When the magazine is published, she is sacked, her lover abandons her and her life becomes a living nightmare as an obsessed man starts stalking her.