Black Clover’s “seasons” are weird, as the show is set up to air every week without interruption. It technically has 3 seasons consisting of 51 episodes (52 in S3) with a 4th that is 16 episodes. Yet, it is all part of the first continuous (technically there was a production delay due to COVID that resulted in a break but that’s an exception) “season” before they went on hiatus after having caught up to the manga and not wanting to make the same mistakes as FMA by making filler and deviating too far from the plot.

And that’s not even getting into the fact each 51 episode season includes multiple story arcs.