So... is Slow Step finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: November 01, 1991
Manga finished: March 01, 1991
... But MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
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
Slow Step tells the story of Minatsu, a high school girl with a secret, and the complicated love lives that unfold around her. She finds herself caught between Shu, a fellow student, and Naoto, a boxer with feelings for a mysterious girl named Maria.
Adding to the confusion, Maria isn't who she seems, and her connection to Minatsu creates a web of hidden identities and unspoken affections. The anime explores the evolving relationships between these characters as they navigate their feelings and discover the truth about each other.
At its heart, Slow Step is a romantic drama centered on a complex love triangle, or perhaps even more complex shape, where appearances can be deceiving and genuine connection takes time to uncover.