Yuka, a married woman working as a librarian, maintains a quiet and composed demeanor at work, yet harbors a hidden allure beneath her reserved exterior. Mr. Ozawa, a company president, has been frequently visiting the library where she works, increasingly drawn to the mysterious charm concealed within her modest behavior. One day, Yuka comes to Ozawa's company for a job interview. Despite lacking experience, she applied as an escape from the painful reality of her husband's infidelity. Sensing her true motives, Ozawa decides not to let this opportunity slip away and offers her a position as his mistress secretary. Standing before her, he passionately presses his tongue against her lips, openly expressing his intense sexual desire...