After our parents remarried eight years ago, Haruto, who is six years my senior, became my stepbrother. Despite not sharing blood ties, he has always shown me kindness and care as if I were his true sibling. However, this affection has sparked within me an unsettling desire to possess him entirely, a secret I am determined to hide. Even as I venture into university life living independently, fate intervenes as my stepbrother unexpectedly reappears in my world, threatening to unravel everything I've tried to conceal.