After 10 years of dating and 8 years of marriage, her husband has grown increasingly busy with work. Once their child started school, he began prioritizing time with friends over their relationship. Their sex life, which had continued steadily for 18 years, abruptly stopped four months ago. Approaching 40, she suddenly realizes how few men she's been with in her life, and is shocked by the revelation. Fearing her life as a woman might end like this, she is filled with anxiety. Though she may regret it later, she resolves to embark on a journey. On this trip, she meets a new man, experiences intense physical pleasure as a woman, and is driven to wild, passionate abandon—body and soul utterly overwhelmed.