The never-ending anime sagas are popular, but I love me some short form "it ends" anime. What's your favorite completed arc series?
Eureka 7 is mine.
[Edit:] Actually I think Soranowoto (The sound of the sky) is my top favorite
If some kind soul cared to compile a list of the suggestions I'll edit the main post to list them all to date.
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Dragon ball z Kai if it can only be 100 Episodes.