A beautiful 22 year old girl. During the day, Yumi works as a regular office lady, but by night, she works as a prostitute. Yumi needs her two jobs to make ends meet. She is materialistic and willing to sell her body to get what she wants. She also needs the extra income to feed her unusual pet, a crocodile, which she keeps in her apartment. Working in an office is quite normal for young Japanese women, but keeping a pet crocodile, and being a prostitute makes Yumi stand out. In truth, few girls are like Yumi. Her family is well-off, but she lives alone because she doesn't get along with her stepmother. Although she hates her, she's very close to her daughter Keiko, her younger stepsister. Yumi meets Haruo, her stepmother's young lover, and comes to love him deeply.