After 20 years of marriage, Tsubasa is a warm and gentle mother living with her corporate executive husband in a luxury mansion apartment in Minato Ward. Now 45 years old, she's reached an age where a woman's allure truly blossoms. Despite her busy daily life, she never forgets to cherish and pamper herself. After a long time, she rediscovers the pleasure of "SEX" and experiences her first "affair," igniting a passionate fire within. As she's pleasured and praised, she sinks deeply into a sensation of complete fulfillment. Her arousal flows endlessly, and her passion knows no limits.