An ordinary-looking cute girl, Kotone, is treated like a pet by her uncle. She constantly wears cat ears, a collar around her neck, a duck-bill gag in her mouth, and has a tail attached to her anus. Despite her embarrassing appearance, she deeply loves her uncle and obediently allows herself to be used as an anal pet, getting repeatedly fucked by one man after another as instructed. Her appearance symbolizes not just her role as a mere pet, but her absolute devotion and loyalty to her uncle.