The best anime are, first and foremost, defined by their most iconic plot lines. Most anime series prefer to split their stories into arcs — standalone narratives that, despite having their own conflicts and resolutions, feed into the overarching plot. Arcs in anime tend to vary in length, relevance, and quality greatly, from essential narratives that directly affect the main plot to filler storylines one could skip without missing out on much.
Source：https://www.cbr.com/greatest-anime-arcs-ever-ranked/
