It was unclear whether Yakuza 6: The Song of Life would have a demo after Sega removed it from the PlayStation Network last month.
The demo was notable for its size due to the demo including all of the data for the full game. The idea was to allow those who played the demo to carry over their progress and trophies to the full game on release day. However, the demo was intended to cap progress at the end of the first chapter of Yakuza 6, but some players either didn't run into that cap or found a way around it. Once that became public knowledge, Sega pulled the demo.
It seems that some tweaks have been made to the demo to ensure no one can get access to the full game now. Players will be able to progress up to the end of the first chapter and then grind experience that will carry over into the full release. However, if you've already played through the demo, any trophies you've earned will be reset.
If you were one of the players who made it past the chapter one cut off point, you will not be able to load that data for the demo. However, the full version of Yakuza 6 should still load that data so you can pick up where you left off.