NO, it is not finished.
The anime finished before the manga:
Anime finished: January 03, 1995
Manga finished: February 01, 1995
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
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Shiratori Nagisa, a popular pink-haired idol, desperately wants some freedom from her idol life and her father's dojo. To escape, she disguises herself as a boy named Ootori Nagisa and enrolls in a new school.
Things get complicated when she falls for Nosaka Akira, a gang leader from a rival school, who also happens to be a huge fan of her idol persona.
Now, Nagisa must juggle her secret identities while navigating her feelings for Nosaka-kun and trying to keep her dual life a secret from him.
Adding to the chaos, her father, Nosaka-kun's father, martial arts animals, and a rising idol are constantly interfering, making her life anything but simple.