So... is Mizuiro Jidai finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: February 27, 1997
Manga finished: April 01, 1997
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
Mizuiro Jidai follows Yuuko, a middle schooler navigating the complexities of young love.
She secretly harbors feelings for her longtime friend, a boy who lives next door.
However, this budding romance is complicated when Yuuko discovers that her close friend also has affections for the same boy.
The anime then delves into the emotional lives of these three characters as they grapple with their feelings for each other, friendships, and the typical challenges of junior high life.
It's a story about relationships, self-discovery, and growing up.