Married woman Kaori has grown tired of her husband, who is obsessed with work and neglects their family life. To relieve her sexual frustration, she begins an affair with her ex-boyfriend. Despite this, she maintains a close and loving relationship with her daughter Saki, and on the surface, their family appears harmonious. However, her life takes a sudden turn when her daughter's boyfriend, Ippei, discovers her infidelity. Using the secret as leverage, he demands sexual favors from Kaori, threatening to expose her unless she obeys. Fearing the consequences if her husband and daughter find out, Kaori submits to Ippei's demands. From that day on, she is consumed by guilt and humiliation, torn between her love for her family, her own desires, and the shame of betraying her daughter. As conflicting emotions intensify, Kaori's heart begins to unravel.