It is a bit ambiguous in this case.
The anime finished before the manga:
Anime finished: December 22, 2006
Manga finished: July 14, 2007
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Asatte no Houkou. tells the story of Karada, a young girl on the cusp of adolescence who longs to be seen as more mature. Her brother, Hiro, returns home, bringing with him his former girlfriend, Shouko, who is determined to understand his reasons for leaving her.
An awkward tension develops between Karada and Shouko, fueled by Shouko's perception of Karada as childish.
Through a mysterious shrine, a wish is granted that dramatically alters their lives, reversing their ages and forcing them to confront not only each other, but also their own inner struggles.
The anime explores themes of maturity, relationships, and self-acceptance as Karada and Shouko navigate their unexpected circumstances.