Even past her forties, Mio's libido only grows stronger. As her desires intensify with age, her husband is stationed overseas, leaving her without sex for a prolonged period. Unable to endure the frustration, she turns to her own son—the closest man in her life. Yet even that fails to satisfy her completely. Through social media, she begins meeting new men, plunging headfirst into a world of sexual indulgence. Behind her actions lies a potent mix of escalating lust driven by age and the loneliness born from emotional distance from her husband.