So... is Oniichan dakedo Ai sae Areba Kankeinai yo ne! finished or not?
NO, it is not finished.
Why?
We found unfinished non-core content:
Sakigake!! Oniichan dakedo Ai sae Areba Kankeinai yo ne (Spin-Off)
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Oniichan dakedo Ai sae Areba Kankeinai yo ne! revolves around Akito and Akiko, siblings reunited after being separated for years due to their parents' passing.
They begin living together, but Akiko has romantic feelings for her brother, feelings that Akito doesn't reciprocate.
Their living situation becomes complicated when three other girls move into their apartment complex, all vying for Akito's attention in their own ways.
The anime explores the humorous and sometimes awkward situations that arise as Akiko tries to win over her brother amidst the affections of these other girls, leading to a chaotic and potentially suggestive living environment.