An ordinary young couple visits a hot spring inn. Their plans to relax and unwind on their trip are forcibly changed by the innkeepers. She is raped in the hot spring, gang-raped in the room, and brutally violated in front of her husband. A penis other than her husband's, sex without love... It should be unpleasant, but the wife's body responds lustfully. Her hidden desire to be cuckolded is exposed, and she surrenders herself to deep pleasure...