Kazuya Kinoshita is a 20-year-old college student who has a wonderful girlfriend: the bright and sunny Mami Nanami. But suddenly, he doesn't. Without warning, Mami breaks up with him, leaving him utterly heartbroken and lonely. Seeking to soothe the pain, he hires a rental girlfriend through an online app. His partner is Chizuru Mizuhara, who through her unparalleled beauty and cute demeanor, manages to gain Kazuya's affection. But after reading similar experiences other customers had had with Chizuru, Kazuya believes her warm smile and caring personality were all just an act to toy with his heart, and he rates her poorly. Aggravated, Chizuru lambastes him for his shameless hypocrisy, revealing her true pert and hot-tempered self. This one-sided exchange is cut short, however, when Kazuya finds out that his grandmother has collapsed. They dash toward the hospital and find Kazuya's grandmother already in good condition. Baffled by Chizuru's presence, she asks who this girl might be. On impulse, Kazuya promptly declares that they are lovers, forcing Chizuru to play the part. But with Kazuya still hung up on his previous relationship with Mami, how long can this difficult client and reluctant rental girlfriend keep up their act? Dumped by his girlfriend, emotionally shattered college student Kazuya Kinoshita attempts to appease the void in his heart through a rental girlfriend from a mobile app. At first, Chizuru Mizuhara seems to be the perfect girl with everything he could possibly ask for: great looks and a cute, caring personality. Upon seeing mixed opinions on her profile after their first date, and still tormented by his previous relationship, Kazuya believes that Chizuru is just playing around with the hearts of men and leaves her a negative rating. Angry at her client's disrespect towards her, Chizuru reveals her true nature: sassy and temperamental, the complete opposite of Kazuya's first impression. At that very moment, Kazuya receives news of his grandmother's collapse and is forced to bring Chizuru along with him to the hospital. Although it turns out to be nothing serious, his grandmother is ecstatic that Kazuya has finally found a serious girlfriend, which had always been her wish. Unable to tell her the truth, Kazuya and Chizuru are forced into a fake relationship—acting as if they are truly lovers.