40-year-old Yumi is a divorced woman with no sense of sexual shame—a shamelessly lustful woman. Her profession? An erotic manga artist who creates incest-themed comics based on real-life experiences, depicting taboo relationships between a father and daughter. While reading her own manga, she fantasizes about sexual encounters with her father and indulges in masturbation. Her daily life brims with sexual stimulation, and her works are direct reflections of her deepest desires. When her editor comes to collect her manuscript, he becomes aroused witnessing her in the act. Caught and noticed, he gives in to temptation and has sex with her. Yet insatiable Yumi remains unfulfilled—until her ex-husband suddenly shows up. She immediately welcomes him in and continues having sex until completely satisfied. Thus begins Yumi's lewd and pleasure-filled day with no limits.