Fake or real girlfriend? (rent a girlfriend harem x male oc)

After his girlfriend broke up with him because she's selfish, Toad Shirogame was stuck in a rut. So in a desperate last ditch effort, he took out his phone and used an app to rent himself a girlfriend. to his surprise, he got the most beautiful girl he could ever have, Chizuru Mizuhara. She didn't really liked him at first, but eventually her feelings for him began to develop even more. The same goes for Toad as he realized that the false feelings he's having for her is starting to become real. But when his ex girlfriend started to come back into the picture, things get really complicated as she's starting to regret breaking up with him. Things get even more complicated when 2 other girls comes into his life. Will he confess to Chizuru in time? or will he get a harem?