the series is very extensive, there are 7 enemies that represent a capital sin, but they all have spare multi bodies, or extensions of their being like Voldemort or Naraku from Inuyasha
it is literally a bummer that they escape and have to fight again.
Each enemy has very exaggerated rules that make them impossible to defeat
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The animated series reaches a point where it is far behind the books and it is impossible for them to animate everything (the books are not finished yet, there is more to write).
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It's not worth following this series unless you want to see your grandchildren grow up and graduate