It is quite a simple story in essence, but I was happy that it returned the origins of the bitbeasts and gave us a bit more of an explanation about them. These Bladers were out to defeat the Bladebreakers and imprison the Guardian bitbeasts. In this instance, 4 innocent people are possessed to embody the Bladers that control the dark bitbeasts. It was a novel idea that was a nice break from the World Championships and the repetitive element of someone trying to steal bitbeasts to rule the world. These bitbeasts are reflections of Dragoon, Dranzer, Driger and Draciel and builds on the idea that these are the Guardian bitbeasts (from season 2). The movie introduces the concept of dark bitbeasts and their release into the world when Tyson battles Daichi for the first time.
All I knew is that it was non-canon and is an alternate account about how Tyson met Daichi (somewhat different to how Harry met Sally.). I have recently watched the 3 seasons of Beyblade and was told about this movie.