As summer vacation draws to a close, Kokona Aoba's plans with her mother are dashed by work commitments. Embracing the change, she embarks on a nostalgic stroll down memory lane, reliving cherished moments. In the midst of autumn, Hinata Kuraue and Aoi Yukimura delve into a childhood scrapbook, sparking a journey into forgotten recollections. Unearthing a peculiar acorn in Aoi's room triggers a cascade of memories, leading Hinata to rediscover a long-buried event. From treasured moments with loved ones to forging new memories, Yama no Susume: Omoide Present follows the trio as they intertwine past and present, weaving a tapestry of nostalgia and new beginnings.