Yuu, a career woman walking through the office district. In the midst of her workday, she feels an uncontrollable excitement—her craving for kisses becomes insatiable. On her way to her next meeting, she's forcefully kissed inside a car, triggering her primal instincts. Feeling as though it's been ages since her last sexual encounter, she actively seeks out lips herself. Tongues entwine, saliva mixes, and her arousal intensifies rapidly, culminating in deep, passionate kiss-filled intercourse where her vaginal opening engulfs the penis. Defiled by vulgar, filthy kissing, her female instincts awaken, driving her arousal higher and higher. A four-part story depicting a woman's overwhelming desire consumed by kissing.