So... is Nijiiro Days finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: June 26, 2016
Manga finished: May 11, 2018
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Nijiiro Days is a story about four high school friends, each with distinct personalities and approaches to life and love.
Natsuki, heartbroken after a Christmas Eve breakup, falls for a girl named Anna, who attends his school.
The anime revolves around Natsuki's attempts to win Anna's heart.
However, his close-knit group of friends, each facing their own romantic challenges, constantly interfere (often with good intentions) in Natsuki's pursuit, leading to comical situations and heartwarming moments.
The series explores the ups and downs of first love and friendship as the boys navigate their high school lives.