My childhood friend—and first love—Mami suddenly appears before me. Seeing her exhausted and asleep, I can no longer suppress my feelings. When she wakes and comforts me, an odd cohabitation begins. Mami declares she wants to become my pet. To fulfill her desires, I put a collar around her neck, and we spiral into increasingly depraved acts. As her emotions and my lust intertwine, our relationship grows deeper and more twisted by the day.