So... is Natsu-iro no Sunadokei finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Natsu-iro no Sunadokei tells the story of Koutarou, a young man determined to confess his feelings to a girl named Kaho during summer vacation.
However, a bizarre incident catapults him into a future where he discovers he and Kaho are a couple, but tragedy has struck.
Armed with this knowledge of a potential future, Koutarou is sent back to his own time. He now faces the daunting task of altering fate itself, aiming to prevent the devastating event he witnessed and protect the girl he loves.