In this series, and Aoi Sato are members of the "Tesaguru" club, where they discuss and deconstruct school club tropes.
Depending on what you are looking for, these articles and resources provide helpful insights into their roles and the series: koharu aoi
: This series features Aoi Yukimura as the protagonist. While there isn't a main character named Koharu, the series is a popular mountain-climbing drama. You can find episode details on the Encouragement of Climb Wikipedia page . In this series, and Aoi Sato are members