It is a bit ambiguous in this case.
The anime finished before the manga:
Anime finished: December 14, 2017
Manga finished: September 13, 2019
We could not confirm the source content in MangaUpdates.
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Haruka Shinozaki finally confesses his feelings to Akiho Kousaka, the seemingly perfect class representative he's admired for a long time. To his surprise, she accepts!
However, Haruka quickly discovers that Akiho, despite her flawless exterior, is completely naive when it comes to relationships.
Determined to be the best girlfriend possible, Akiho goes to rather extreme lengths to learn about intimacy and please Haruka, leading to humorous and awkward situations.
Haruka finds himself navigating this unexpected turn of events, trying to balance his burgeoning relationship with Akiho's unusual dedication and his own embarrassment at her methods.