Kazuya Kinoshita has broken up with his girlfriend Mami Nanami after dating for about a month. He uses an online app to rent a girlfriend named Chizuru Mizuhara, a beautiful and attractive girl. However, because she appears to be too perfect, he writes her a low rating, but then Chizuru berates him for that and reveals she is meaner than he expected. However, when Kazuya's grandmother collapses in the hospital, he brings her along and the grandmother is smitten with how great she is. Kazuya continues renting Chizuru in order to keep up appearances with his family and friends, but things get complicated when they discover they are next-door apartment neighbors and attend the same college. Later, other girls from the girlfriend business also join in dating and showing interest in Kazuya.