46-year-old Kasumi Shingu boasts an elegant appearance and a slender, graceful figure. As a sales department manager at a foreign company, she tirelessly juggles her role as a career-driven wife. Married for 20 years, she and her husband strictly divide household and parenting duties, and she insists she has no intention of settling into domestic life just yet. "Right now, I want to aim even higher," she says, driven by ambition—but this relentless drive has taken a toll on her marriage. With constant work obligations, client entertainment, and after-work study sessions, followed by childcare and housework upon returning home, she gradually fell into a sexless relationship. Too hesitant to pursue an affair, she resorted to self-pleasure to ease her frustration. Even during work hours, erotic fantasies constantly drift through her mind, revealing the hidden desires of a deeply repressed businesswoman. Here, she experiences pleasure with another man's cock for the first time—ushering in a thrilling new sensation.