So... is Futari Daka finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: July 12, 1985
Manga finished: August 01, 1985
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Futari Daka tells the story of two young men deeply passionate about motorcycle racing.
Their paths collide dramatically on the track, beginning as a near-fatal accident.
Discovering a shared first name, an intense rivalry ignites between them, fueled by their exceptional racing skills.
Beyond the competition and their common name, they find unexpected similarities drawing them together.
The anime explores their journey as rivals who discover they share more than just a love for speed.