So... is School Days finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: September 27, 2007
Manga finished: September 26, 2007
... 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.
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Synopsis
Makoto, a high school student, develops a crush on Kotonoha, a girl he sees on the train.
Too shy to approach her, he secretly keeps her photo as his phone's wallpaper, hoping it will bring them together.
Sekai, a classmate, discovers his crush and unexpectedly offers to help him connect with Kotonoha.
The three of them form an unusual friendship as Makoto navigates his feelings for Kotonoha with Sekai's assistance.
School Days follows their intertwined lives, exploring the complexities of teenage relationships and emotions.