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About : Sai Rin is Shou's twin sister, and renowned as the "manliest woman in Sa Province." When first encountered, she is the head of the Merchant Guild in Koren. After her term of guild leadership expires, she becomes an inventor. When Shuurei calls doctors to treat the disease in Sa Province, Rin designs a smooth knife suited to surgical operations; Rin later designs a centrifuge-like device to separate out sand from adulterated salt. She fell in love with Yuushun Tei when he was still Ensei's assis...