So... is Gakuen Utopia Manabi Straight! finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 26, 2007
Manga finished: February 27, 2016
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
Gakuen Utopia Manabi Straight! tells the story of Manami Amamiya, a new transfer student to Seioh Private High School, a school struggling with low morale in a futuristic world facing a declining birth rate.
Manami's arrival brings a fresh perspective to the student body. Following some humorous and inspiring events, she becomes the student council president.
The anime focuses on Manami's efforts, alongside her friends Mika, Mutsuki, Mei, and Momoha, as they work together on student council activities.
A significant part of their focus is dedicated to planning and organizing the upcoming student festival, aiming to revitalize the school's spirit.