Before I begin, sorry if this is long.
I'd suggest playing season 1 first. This game was inspired by shows like Charmed, so expect a lot of supernatural elements. There are amazing characters with equally amazing personalities, some of which you can romance if you want. The game has you customize your preference when it comes to romantic or sexual attraction to fit how you want. You can also customize your appearance to how you want along with a few other aspects about yourself. There is also an amazing overarching storyline throughout the three seasons, with a final season on the way. I won't go into any spoilers but there are even parts of the game where your choices can change some details later in the story, so I'd recommend starting on season 1 because you can download your game's save data and export it to season 2 and so on with 2 to 3, that way it's more consistent. The game's creator, 13Leagues, is doing a rework of seasons 1 and 2 to bring it in line with the current vision of the game and changing how some things work. You can however still play both of them despite the coming updates, which I would highly recommend because this story is honestly one of the most interesting things I've read and is one of, if not the best game/stories I've ever been interested in.