travo said:

How many games are in the series?

That question is a little more complicated than it used to be now that they've done so many spin-offs.

The main series has seven games in it, Yakuza 1 - 6, and a prequel Yakuza 0. All feature the main character Kiryu, who retires at the end of 6.

Then the game basically spins itself off into a new series called Like A Dragon, and turns into a jrpg and features a new main character. There are two games in that series.

Kiryu is brought back in between those two games though in a side game called The Man Who Erased His Name.

And most recently another side game was released featuring a different reoccurring character called Pirate Yakuza in Hawaii. The character in question is kind of batshit crazy, so the concept of the game seems to work just based on him.

Then there were two other side games - Ishin, which takes all of the characters and reimagines them in 1800s, Japan, and then some zombie game that most people prefer to forget about all together.

And finally there is another spin-off series called Judgement that is basically a cross between Yakuza and Phoenix wright. Two games in that series.

So the answer is either 7 or 15.