New to hyperdimension neptunia

So since theres a steam summer sale i was looking thru the neptunia series. Can someone guide me if i were to start neptunia which series do i begin first on steam ?

Umm I think after you play Re-birth 1 and 2 to introduce the characters, it doesn't matter what order cause they're all stand alone games.

@capcharisma Actually they're not stand alone games, not all of them. Rebirth 1 is it's own thing, it's own universe but it's a great way to kick off the series and getting introduced to the characters. Rebirth 2 is another universe but from here on is where there is continuity in the other games. I personally liked the story of this game over the first. Rebirth 3 happens later after Rebirth 2, if you care about story. And then with Megadimension Neptunia V-II coming soon for Steam, that game happens after Neptunia Victory/Rebirth 3 Everything else is stand alone side games and should only play them if you really enjoy the series.