Heartbroken after being dumped by his girlfriend, college student Kazuya Kinoshita tries to fill the emptiness in his heart by hiring a rental girlfriend through a mobile app. Enter Chizuru Mizuhara — beautiful, sweet, and seemingly the perfect girlfriend. But after their first date, Kazuya stumbles across mixed reviews about her online and, still reeling from his breakup, convinces himself she’s just toying with men’s feelings. In a fit of emotion, he leaves her a harsh rating. Chizuru, furious at his unfair judgment, drops her sweet facade and shows her true personality — sharp-tongued, quick-tempered, and nothing like the dream girl Kazuya thought she was. Just as tensions rise, Kazuya receives shocking news: his grandmother has collapsed. Panicked, he rushes to the hospital, dragging Chizuru along. Though the situation turns out to be a false alarm, Kazuya’s grandmother is overjoyed to meet the “girlfriend” she had always hoped he’d find. Unable to break her heart with the truth, Kazuya and Chizuru reluctantly agree to keep up the charade — pretending to be lovers, at least for now…