So... is One: Kagayaku Kisetsu e 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
Kouhei returns to his old hometown after a prolonged absence, motivated by forgotten promises made to girls he knew in his youth.
He struggles with amnesia and a troubled history, hindering his efforts to reconnect.
The anime has a surreal atmosphere, suggesting a fragmented past and unresolved memories piecing themselves together.
It focuses on Kouhei's journey to rediscover himself and his relationships within this dreamlike reality.