So... is Kishuku Gakkou no Juliet finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 22, 2018
Manga finished: September 04, 2019
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Kishuku Gakkou no Juliet is a romantic comedy set in a boarding school where students from two rival nations reside.
The leaders of these two student groups, Romio and Juliet, outwardly despise each other, perpetuating the animosity between their dorms.
However, unbeknownst to everyone, they are secretly deeply in love.
They must navigate the challenges of a forbidden relationship, concealing their feelings to maintain the fragile peace within the school.
As their love grows, they face difficult decisions about the possibility of revealing their secret and the potential consequences it might bring.