So... is _Summer 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
Summer is a coming-of-age story centered around Kaizu Takumi during his last summer of high school.
After a friend's question makes him realize he hasn't considered romance, Takumi begins to examine his feelings for the girls around him.
He suddenly finds himself surrounded by possibilities, including his childhood friend, a classmate, and even a popular school figure.
Driven by a desire to experience romance, Takumi sets out on a journey of self-discovery to find a girlfriend before summer ends.
The anime explores Takumi's journey as he navigates his newfound awareness of romantic feelings and tries to determine who he truly cares for.