So... is Hi-Speed Jecy finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished after the manga:
Anime finished: March 05, 1990
Manga finished: September 30, 1987
... 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
Hi-Speed Jecy tells the story of a young man, Jecy, driven by a thirst for revenge after his parents are murdered by the Bismark House, a criminal organization.
This group is obsessed with obtaining a substance called 'lyzorium,' and Jecy is determined to make them pay for their crimes.
Possessing remarkable speed and agility, Jecy embarks on a journey through space, accompanied by Tiana, a priest named Fork Green who has a unique approach to justice, and a sentient spaceship named Paolon.
Their path is fraught with danger, as they face numerous opponents, including a woman named Jera and her ruthless brother, Cross, who are all obstacles in Jecy's quest for vengeance.