"Rent-A-Girlfriend" centers on Kazuya Kinoshita, a college student who, after being dumped by his girlfriend Mami Nanami, turns to a rental girlfriend service to cope with his loneliness. Through the service, he meets Chizuru Mizuhara, a charming and professional rental girlfriend who initially appears to be the perfect companion. However, their relationship takes an unexpected turn when Kazuya discovers that Chizuru is not only his neighbor but also a fellow student at his university. Despite their initial transactional arrangement, their lives become increasingly intertwined as Kazuya continues to rent Chizuru’s services, often leading to awkward and comedic situations.

As the story progresses, Kazuya’s feelings for Chizuru grow more complex, blurring the lines between their professional and personal relationship. Chizuru, on the other hand, maintains a professional demeanor but gradually reveals her own vulnerabilities and aspirations, particularly her dream of becoming an actress. The narrative explores their evolving dynamic, as well as Kazuya’s struggles with self-doubt, insecurity, and his lingering feelings for Mami. Meanwhile, other characters are introduced, including Ruka Sarashina, a rental girlfriend who develops genuine feelings for Kazuya, and Sumi Sakurasawa, a shy and reserved rental girlfriend who forms a close bond with him.

The series delves into themes of love, self-discovery, and the complexities of human relationships, often balancing comedic moments with emotional depth. Kazuya’s journey is marked by his attempts to navigate his feelings for Chizuru while grappling with his own shortcomings and the expectations of those around him. Chizuru’s character is similarly explored, as her professional facade begins to crack, revealing her true emotions and struggles. The interplay between the main characters creates a layered narrative that examines the challenges of forming genuine connections in a world where relationships can be commodified.