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A Nepalese boy, Surya, finds a crane with a letter requesting help. His search to find the letter’s writer takes him to a mysterious Himalayan kingdom.
Aoi continues to challenge higher and more difficult mountains (and volcanoes), helped and accompanied by childhood friend Hinata, upperclassman Kaede, and middle-schooler Kokona. Along the way, they discover the wonder and enjoyment that mountain-climbing can bring, despite the frequent hardship.