Akai inshû: Kamitsu no shitatari

Mayu, a stylist, and Ryoichi, a photographer, are dating with the intention of getting married. However, Mayu discovers that Ryoichi is having an affair with a model, and they have a big fight. He says he's cut ties with her, but Mayu's anger doesn't subside. Around that time, her friend Nagisa confesses that Ryoichi raped her. Shocked, Mayu lets Nagisa stay at her house for a while, but Nagisa starts acting strangely, pressuring Mayu into lesbian acts and wearing Mayu's clothes without permission...