A married woman who has just moved into a new apartment always enjoys taking care of others, like a caring older sister. Her gentle yet slightly vulnerable demeanor gradually draws me in, and I eventually take advantage of her kindness, making advances toward her. She has a strong-willed personality and, furious at the sudden assault, slaps me hard across the face. However, her anger quickly transforms into pleasure. Though she initially resists, she soon finds herself unable to hold back. Watching her, you can sense her true nature slowly awakening. Before long, she undergoes a complete transformation—one far more shocking than imagined, captivating the viewer right until the story's end.