Kanno Tsubaki plays Shinon, the granddaughter of a wealthy Kyoto family, who has lived happily for 21 years married to elite bureaucrat Kitagawa. But one day, she suddenly begins experiencing severe pain deep within her uterus, making sex with her husband unbearable. Tormented by her body's betrayal, she condemns herself as a lustful woman, sinking into deep psychological conflict. During her husband's business trip, a younger salesman, Sawatari, visits her. His passionate demeanor becomes the catalyst that shakes Shinon's heart. The story follows her journey of self-discovery as she navigates emotional turmoil and a new romantic entanglement, torn between loyalty and desire.