Jilted and heartbroken after just a month of dating, 20-year-old college student Kazuya Kinoshita turns to a rental girlfriend app out of sheer desperation. This leads him to a fateful encounter with Chizuru Mizuhara, a stunningly beautiful and seemingly perfect girl. However, after a chaotic first date and a sudden family emergency, they discover that they not only attend the same university but also live as next-door neighbors. Forced by circumstances to keep up the charade, their complicated, rental-based relationship officially begins.