It is a bit ambiguous in this case.
The anime finished before the manga:
Anime finished: December 23, 2015
Manga finished: September 27, 2018
We could not confirm the source content in MangaUpdates.
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Ore ga Ojousama Gakkou ni "Shomin Sample" Toshite Gets♥Sareta Ken follows Kimito, a seemingly ordinary guy who gets unexpectedly thrust into an exclusive all-girls academy.
Mistakenly believed to have an unusual preference, he's brought in to be their "commoner sample," a way for the sheltered students to experience the outside world before graduation.
For his own safety, Kimito must maintain this false image while navigating the bizarre personalities and unique quirks of the girls around him.
He joins a special club with a few of these girls, where they all learn from each other, exploring the differences between their sheltered lives and Kimito's more ordinary existence.
It's a comedic journey of cultural exchange and hilarious misunderstandings as Kimito tries to survive his new, opulent, and slightly dangerous environment.