One winter night, Yukari entered a public restroom to use the toilet. Suddenly, she was attacked from behind and raped. That experience became unforgettable for her. After that, she could no longer feel satisfied having sex with her husband and began visiting public restrooms again. Masturbating there brought her a special kind of pleasure. She started leaving her phone number in the restroom, secretly wishing for someone to violate her again. This urge continues to stir her mind relentlessly.