Kokona Aoba's plans for quality time with her mother on the final day of summer vacation were dashed due to work commitments. Determined not to let the day go to waste, she takes a stroll down memory lane, revisiting familiar places that hold sentimental value. As autumn approaches, Hinata Kuraue and Aoi Yukimura flip through a scrapbook filled with cherished images from their childhood. While perusing Aoi's possessions, Hinata comes across a curious acorn that triggers a flood of memories, recalling long-forgotten moments from their youth. Enter the world of Yama no Susume: Omoide Present and follow the girls' journey as they reminisce about old memories while simultaneously creating new ones. This anime explores the significance of memories and the importance of cherishing them for years to come, from cherished moments with loved ones to forgotten promises of the past.