So... is Ganbarist! Shun finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 10, 1997
Manga finished: January 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
Ganbarist! Shun follows the journey of Shun Fujimaki, a determined high school freshman with aspirations of Olympic gold in gymnastics.
Despite lacking prior training, Shun's unwavering passion fuels his decision to join the school's gymnastics club, embarking on a challenging path to achieve his ambitious dream.
The anime chronicles Shun's efforts to improve and grow as a gymnast, highlighting his interactions with supportive teammates, the camaraderie he experiences, and the joy he discovers in dedicating himself to the sport.
Furthermore, the story explores Shun's personal life, including his budding romantic feelings for a classmate, adding another layer to his high school experience as he strives for gymnastic excellence.