Married woman Shoko has been in a rut with her husband for years, having little sexual activity at night. Although she desires intimacy, she masturbates alone every evening. One day, she calls a plumber to fix the bathroom sink. During the repair process, she becomes aroused and accidentally urinates on herself. As the plumber cleans up after finishing his work, he notices the scent of urine coming from Shoko's panties and decides to investigate further. Upon returning home, Shoko pays him and asks if he would like to see just her panties; flustered by her boldness, she lifts up her skirt...

昭子は夫と倦怠期で、何年も夜の営みがなかった。本当はしたいのだが毎晩一人で自慰をしていた。ある日、トイレの修理に水道屋さんを呼ぶ。昭子は修理中にもよおしてしまい、お漏らしをしてしまった。水道屋さんに片付けてもらう間にシャワーに入る昭子。片付けが終わり、昭子を呼ぶために洗面所に入った水道屋さんは、パンティに気づき匂いを嗅いでいた。帰り際、料金を渡した昭子は「パンティだけでいいの？」とスカートをたくし上げた…