Mutsumi Kagidou finds herself being blackmailed by a perverted student, Inuhiko. The blackmail material? An uncomfortable photo of her. In order to get the photo back, she becomes Inuhiko's sex slave and the've many debauched sex. After a few years though, Mustumi tells Inuhiko to neglect the photo since she doesn't mind being his sex slave anymore. And so, a 'unique' relationship is created between the two of them.