The cast of Rent-A-Girlfriend:
Kazuya (aka The Simp King)
This is not a man, this is a manchild. Saying that he has the emotional maturity of a 14 year-old would be an insult to 14 year-olds. He's a chronic liar, a stalker, an overall moron, and he is so ill-equipped to handle reality that he has actually gotten down on the floor and kicked his feet like a toddler when he can't deal with life. Multiple times. Remember, this mentally challenged buffoon is supposed to be an ADULT. I understand that emerging adults are still learning and growing as they try to find their place in the world, but there is just no excuse for this level of idiocy. I was also tired of being shown how often he masturbates and who he masturbates to. (Why the hell would somebody get off on the thought of their ex having sex with another man, anyway? And why do we have to know about it?) In a nutshell, Kazuya is everything I hate in useless, pathetic, indecisive male protagonists that have permeated this kind of anime for decades. The only reason I can figure these girls like him (aside from his simping) is that they are all stupid. And crazy. Speaking of which, let's take a look at the ladies...
Chizuru
Chizuru is pretty, confident, and competent at her job as an escort. Unfortunately, as soon as she meets our protagonist, she turns into a fucking idiot. And a liar. While I'd love to place the blame all on Kazuya, I can't. She has willingly followed him into his problems more than once and put herself in the middle of his drama. And despite all her complaining, whenever she has an opportunity to extricate herself, she doesn't. I don't think she really wants to, because she likes Kazuya and doesn't want to admit it. She therefore becomes an enabler, and she's got herself to blame for being embroiled in Kazuya's issues because she could have put a stop to this bullshit at any time. She also gets the Stupidest Moment of the Season award, when she starts feeling unwell and decides to get up out of her seat and go lean over the edge of the boat she's on and falls overboard like a dumb bitch.
Mami
This chick is psycho, and I'd hope for
Truck-kun to run her over if it weren't for the fact that she might get isekai'd to another world and the innocent people there would have the misfortune of dealing with her. She's Kazuya's ex-girlfriend, and one might think that she dumped him because he's a childish loser and she realized she could do better. Nope. Once she thinks he has a new girlfriend she's on a mission to get him back (for whatever reason) and is willing to pull whatever creepy, manipulative stunt she's got up her sleeve to accomplish this, including renting a female escort to date so she can try to learn more of Kazuya's business than she has any right too. I really hope she gets a School Days type ending.
Ruka
SO. FUCKING. ANNOYING. Another adult with maturity issues, Ruka becomes obsessed with the Simp King and begins clinging to him, stalking him, and basically doing everything she can to force herself into his life. When he runs out of the money his parents gave him for living expenses (that's what happens when you spend a year blowing it on dates with a female escort) and has to take a part-time job, Ruka makes sure to get employed at the same place so she and Kazuya can "spend time together". But then he can hardly complain about being stalked when he's doing plenty of stalking himself, and since Kazuya doesn't have the balls to tell this little twit no, she eventually becomes his girlfriend in spite of the fact that he's interested in a different woman. God, I hate this show.
Nagomi (Kazuya's Grandmother)
She seems funny at first, but this nosy old bat got on my last nerve by the end of the show. Her grandson is clearly emotionally stunted and she thinks he needs a future wife??? Sorry to burst her bubble, but her grandson doesn't need a girlfriend. He needs to be in therapy before he winds up homeless or in jail. He also needs to NOT have his grandmother constantly in his business pressuring him. And then there's the bath scene where this entitled old crone gropes a woman young enough to be her granddaughter. Just... ew. First ecchi bath scene I've ever seen featuring a senior citizen and I hope to never see one again. Not sexy at all, just really cringe and creepy.