So... is Yankee Reppuu-tai finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished after the manga:
Anime finished: April 21, 1996
Manga finished: February 05, 1994
... But we could not confirm the source content in MangaUpdates.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Yankee Reppuu-tai revolves around groups of incredibly tough young men and women, often sporting elaborate hairstyles, who are engaged in fierce conflicts over territory.
These battles often involve motorcycles and a strong sense of vengeance, typically sparked by the death or injury of a friend.
The story is inspired by a manga about an exceptionally resilient protagonist who constantly changes schools, highlighting the extreme dedication to toughness prevalent in the series.
Essentially, it's a series of escalating fights and rivalries between different biker gangs as they strive for dominance.