What would happen if someone, seeking the experience of living as a woman, became consumed by sex? A fantasy once ignored during adolescence suddenly resurfaced when, as a college student, [Arisu] was made up by a girl from her club—and from that moment on, she couldn't get it out of her mind. To confront this desire, she chose crossdressing and began a new life. But what awaited her was a life as a female-presenting sex slave. Enchanted by the experience of living as a woman, [Arisu] grew increasingly obsessed with the desire to "fall deeper into being a woman"—to become a true female submissive. Though she had just pledged herself as a pet to her Master, she couldn't last even weeks before having sex with countless men. Even her Master's scornful words—"You've become a slut"—only intensified her arousal. The pain of her penis being slapped only made her erection stronger. Each time, she would whisper, "I'm sorry. Please train me, a perverted Arisu, into a cumdump anyone can use..."—punishing herself with her own words.