Yakuza 0 is a great game and a great introduction to the Yakuza series. It is a stand alone prequel which means you can play it first with out knowledge of the rest of the series. There are two story lines featuring Kiryu and Majima and tons of sidequests giving the game a lot of playable time with out resorting to backtracking hell. The game adds a lot of depth to Majima, who initially was a joke character that the series' audience fell in love with. Majima is now featuring more in the remakes of the first two games, Yakuza Kiwami and Kiwami 2.