@Excalibur-23 No need for the insult, i'm happy with my life decisions, i have a beautiful wife, a well paid job and a great home, not that im bragging
And the rent-a-girlfriend plot is just the beginning and point of start for them, is the whole premise of the manga but from some time ago that has lost all importance, if the rent-a-girl was still the main plot we would have seen at least 3 o 4 more girls in the rental business, and yet we only know Ruka (who was paid-dating another guy when she meet Kazuya and quickly give up the job) and Sumi (who was only rented because Chizuru asked for it and only have a friendship relationship with Kazuya)
I'm not talking about how he is basically buying a girl, i'm talking about the boy-meets-girl and they fall in love
And i mean... spending thousand of dollars in a one sided relationship for a girl is basically the most normal thing in the world, and look at the manga... looks like it wasn't so one sided like you said if she has feeling for him.