>>2034830>>2036174Pretty much what he said, Its taking place 1000 years later and probably wont have too much to do with the predecessor. There are probably going to be parts that are lost on the player or maybe even a little confusing, but it most likely wont hinder the story. That being said
Here are some videos on the previous games and story
https://www.youtube.com/watch?v=JE6n2KGbaZ0(30 Min condensed story)
This one is currently unfinished, but goes a little more in-depth
https://www.youtube.com/watch?v=EnwEbOHo7Aw(48 Mins so far)
He also has a drakengard series on his channel that's 2 hours long. If you have the time, it's worth it.