Slender and beautiful, Ai Mukai is a devoted married woman who values her role as a wife. Once a month, when she sees a man, she's overwhelmed by an uncontrollable urge—an intense desire to lick his body. She doesn't fully understand why, but this time, the feeling was stronger than ever. While it's normal for her to lick her husband's body, this time she became intensely attracted to a technician who came to inspect the electrical system. She couldn't resist licking his body repeatedly. She even lost control when she reunited with her husband's younger brother, giving in to the same overwhelming impulse. Her actions reveal a strangely captivating side hidden deep within her.