Three years ago, her husband passed away, leaving behind a mundane and uneventful daily life. However, the gaze of her stepson—her late husband's child—grows increasingly intense, drawing her in. One day, that gaze transforms into desire. Bound with dangerous restraints by her stepson, "Yuu" finds herself trapped in a world where her body is relentlessly toyed with. Even while tied up, she surrenders to pleasure, repeatedly engaging in intensely erotic sex that pushes her closer and closer to her limits. But how long can this pleasure last? A climax awaits—one that surpasses all boundaries and burns itself out completely.