Married woman Natsumi (34 years old). In her second year of marriage, she and her husband are both working professionals. Her husband is a former colleague, three years her senior. They were close friends for years, but after both broke up with their partners around the same time, they grew closer, dated for six months, and then married. They lived happily together, dreaming of starting a family and having a child within a year. However, one day rumors of her husband's infidelity surfaced. Although he denies it, the incident cracks their marital bond. On the surface, they remain a loving couple, but their relationship gradually grows distant. Struggling with the pain of infertility, Natsumi decides to take a trip to prove herself, to get back at her husband. Overwhelmed by guilt, she embarks on a two-day, one-night journey with a man she's just met, and as her suppressed desires surge uncontrollably, she surrenders to passion. The story captures the inner turmoil of a married woman torn between loyalty and longing, as she wavers within the whirlpool of desire.