Anime Logic: At the end of a season, the main character is strong enough to destroy the universe. I'm the next season, simple low-level baddies can already do that and the main character has to get stronger.

Repeat indefinitely.

Anime is like an RPG with scaling.

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@Chameloshi There are still missing, the main protagonist is so weak at first but gets stronger in the long run, too OP at the end.