So... is Sotsugyou M: Ore-tachi no Carnival finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: April 21, 1999
Manga finished: January 01, 1996
... But 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.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
Synopsis
Five friends, Kato, Shimura, Arai, Nakamoto, and Takagi, attend an all-boys boarding school.
Their ordinary school life takes an unexpected turn when they find themselves at odds with the student government president.
Through a series of events, the group of friends are manipulated into staging a rather unconventional school play.
The play is none other than "Little Women," a story vastly different from their typical all-boys school environment.
The anime follows their comedic journey as they grapple with the challenges of putting on this unusual performance.