If you liked
Re:Zero kara Hajimeru Isekai Seikatsu
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...then you might like
Kanojo, Okarishimasu
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This is probably a weird recommendation, but I do think if you really like the characters of Rent-A-Girlfriend, you'd probably find something similar in Re:Zero. Both Kazuya and Subaru are complete simps at the start of the series. They're made to be pathetic, annoying, helpless, and they both reflect a lot of boys around that age. If you like Kazuya because you can tell he's not a bad guy deep down and are cheering for him to get better, I think you can find something really similar with Subaru. Alternatively, maybe you like Rent-A-Girlfriend because of its plethora of cute girls. And Re:Zero definitely has a good array of waifus too if that's what you're into. Granted, Re:Zero is completely different from Rent-A-Girlfriend in terms of tone. One's a slice of life harem romcom, the other is a dark fantasy isekai. But I think at their core, they both tell the same kind of story. They approach it from vastly different ways, but those different ways also make it so that you don't feel like you're watching through the same show twice.