Kazuya Kinoshita is a college student who, after being dumped by his girlfriend, decides to use a mobile app to rent a companion. He meets Chizuru Mizuhara, a stunningly beautiful and seemingly perfect girl. However, after their first date, Kazuya feels she is insincere and leaves a low rating, prompting Chizuru to reveal her true, fiery personality. Their lives become inextricably linked when Kazuya's grandmother falls ill, forcing him to introduce Chizuru as his real girlfriend to keep his family happy. As the series progresses, the duo finds themselves trapped in a web of lies, maintaining their fake relationship to satisfy their families while navigating the complexities of their genuine feelings. The situation grows increasingly complicated as other 'rental girlfriends' enter the fray, each with their own agendas and emotional baggage. Kazuya must navigate the thin line between professional service and true romance while struggling with his own insecurities and personal growth.