Ishura is an example of when you have a unique, fantastic idea, you started to draft it... and then... that's it... you started... Same with this anime. Again, the idea is unique, but there is no clear plot, there is no clear end goal, the timeline of the story is chaotic, the characters' motives are shallow, and all of this ofc stops the story from going anywhere... It is as if the author had this idea of 'what if we put a bunch of overpowered demon kings and heroes in one place and made them fight each other...' and then the idea stopped at that. Anyway, the animeisn't bad; it could have actually been one of the best anime series if there was an actual plot. The visuals are stunning, the animation is so good, the music, the character design, etc., but... in simple words, the anime doesn't have a clear direction.