Freshly arrived in the city from the countryside, new office lady Saki is raped by her branch manager, Sugaura, whom she secretly liked. After work, he lures her into staying late and forces her into a relationship through blackmail and threats. From then on, Saki's life as Sugaura's obedient sex slave begins. She tries seeking help from other coworkers, but no one suspects his actions. Gradually, people start noticing that Saki's behavior has become strange. Eventually, the truth comes to light.