Persona's basically Pokemon with demons and dating sim elements in Japanese high schools. Each numbered entry is its own contained story so just jump in to the one that has the vibe you like. P5 is probably a good starting point thanks to it being the most recent entry and it oozes style.

Much of the same can be said about most of the mainline Shin Megami Tensei entries too, but they can offer some pretty cool premises. My go-to is SMT: Strange Journey. It's an awesome cosmic horror set in a black hole discovered in Antarctica. If you like grid-based dungeon crawlers then you might really enjoy it.