Yui Hatano, a married woman, engages in her first affair after marriage with a man she met through an app, meeting him at a hotel. What began as a simple break from reality gradually transforms when the man pulls out a rope, shifting her emotions entirely. Her curiosity about being tied up grows deeper, filling the empty spaces within her heart. With each moan, tension builds, and she confesses, "I think... I might have started to like being bound..." A brief moment of escape evolves into a new, intense relationship.