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Maki climbed Mount Fuji at the age of ten and made many climbs in his teens, including Mount Aso. He established a climbing club while studying law at Keio University in Tokyo, from which he graduated in 1919. He continued his studies in the United States and Great Britain.[1]
In 1922, he made the first winter ascent of Mount Yari (3,180 metres (10,430 ft)) in Japan. In 1925, with five other Japanese mountaineers and three Swiss mountain guides, he made the first ascent of Mount Alberta (3,619 metres (11,873 ft)) in the Canadian Rockies.[5] The expedition was sponsored by Prince Chichibu.[1]
In 1926, he was again in the Alps, making the ascent of the Matterhorn via the Zmuttgrat, and climbing with Prince Chichibu.[1][6]
Maki's climbing career was interrupted by World War II, preventing him from leading a Japanese expedition to the Himalayas.[1] In 1956, Maki led the third Japanese expedition to the Nepalese mountain Manaslu, where expedition members Toshio Imanishi and Sherpa Gyalzen Norbu made the first ascent of Manaslu on 9 May 1956.[7][1][8]