So... is Hayou no Tsurugi: Shikkoku no Mashou finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 25, 1992
Manga finished: March 01, 2017
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Hayou no Tsurugi: Shikkoku no Mashou tells the story of Rasutel, a girl living in a floating castle and chosen by a powerful, sentient sword to undertake a dangerous mission.
Her primary objective is to rescue a princess who has been abducted by a demonic entity known as a Youki.
Along the way, Rasutel receives assistance from an unusual Youki named Anshu, who, despite his nature, appears different from other demons.
However, her quest is complicated by her younger brother, who is also connected to the demon world. He seeks to claim Rasutel's golden eyes, a symbol of their shared heritage from their father, a Golden Youshu. This puts them at odds, creating a significant obstacle for Rasutel.