Persona 5 Royal. I never played any Persona games before. It took me quite some time to get into it, especially the time management aspect. But at some point it clicked and I could not stop playing. The ending actually brought tears to my eyes.
This one's mine too. I had played the vanilla version a couple years after release. I always love Persona, but I loved how well integrated the new content was, along with the writing for the new character. The ending (what I considered one of the weakest moments of vanilla P5) was such a huge improvement, too.