Akari, a full-time housewife, lives a peaceful and ordinary life with her husband. That calm is shattered when she runs into Arashi, her ex-boyfriend from high school, for the first time in ten years. This strange reunion triggers a cascade of events that slowly erode her everyday existence. Outbursts of obsessive love, twisted desires, and long-buried unpleasant memories resurface, pulling Akari into a volatile triangle between her husband, her ex, and herself. As the emotional pressure mounts, the narrative asks who among them is the most unhinged, blending psychological tension, romantic turmoil, and a mystery that keeps the reader guessing. The story unfolds as a dark, suspenseful exploration of the lengths people will go to when love becomes a form of madness, set against a contemporary backdrop of domestic life turned claustrophobic and dangerous.