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During the war between the Soga and Mononobe clan, Mononobe no Futo betrayed her family and allied with the Soga. As a result, the Soga were victorious. Later, Toyosatomimi no Miko, a saint, was afraid to undergo the process of immortality alone and used Futo as her test subject. Futo trusted Miko and suspended animation first. After confirming that Futo wasn't decaying, Miko went to rest after. Their resurrection was being prevented by Buddhist monks.
During Ten Desires, Futo eventually woke up and encountered the heroines. At first, she thought that the heroine came to celebrate her resurrection and decided to test her abilities on them (Reimu's story), protect the mausoleum from grave-robbers (Marisa's story), to remove her bewilderment (Sanae's story) or was simply being attacked (Youmu's story). After she was defeated, she was surprised on how strong the heroine was. After noticing that the heroine was being surrounded by divine spirits she quickly left making a pardon, except in Youmu's story where she escorted her to the mausoleum, as Futo thought that Youmu was a Shikaisen.