So... is Tokimeki Tonight finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: September 22, 1983
Manga finished: April 01, 2000
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Tokimeki Tonight follows the story of Ranze Etou, a seemingly ordinary fifteen-year-old girl.
However, her family is anything but normal: her father is a vampire and her mother a werewolf, and they're concerned about Ranze's delayed supernatural abilities.
Ranze's life takes a turn when she falls for Shun Makabe at her new school.
Navigating the complexities of first love proves challenging as she deals with the rivalry of another girl, disapproval from her monster parents who don't want her dating a human, and the sudden emergence of an unpredictable and unusual shapeshifting power.
The anime explores themes of self-discovery, the challenges of growing up, and the difficulties of young love, all while balancing a normal life with her extraordinary family and burgeoning supernatural abilities.