So... is Lemon Angel YJ-ban finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: August 03, 1990
Manga finished: January 01, 1990
... 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
Lemon Angel YJ-ban is an anime adaptation of a manga series. It likely follows the adventures or experiences of characters featured in the original manga, possibly focusing on themes or storylines present in the Young Jump serialization. Expect the anime to present a narrative drawn directly from or inspired by the source material.