The rest of the Machine Robo series has been subbed except this three-episode OVA series. I'm guessing it might be rare because there aren't even any raws listed on AniDB.
Anime requests
Leina Kenrou Densetsu (OVA, 3 episodes, AniDB)
Requested on Jan. 4, 2022, 10:20 a.m.
When Revenge of Cronos left off, Rom and Leina had crossed a dimensional barrier. Their physical forms changed from robot to human and they were separated with blurred memories. Leina Stol is now incarnated as Leina Haruka, a Japanese schoolgirl. As the story progresses, she meets up with Rod Drill, Blue Jet, Triple Jim, and Rom; all of whom are now human. Source: Wikipedia
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Raws available here: https://9anime.id/watch/machine-robo-leina-the-legend-of-wolf-blade.80n4y/ep-1raw