She grew up in Yuba's village alongside her older brother Shin and their parents, until an epidemic wiped out her mom and dad when she was young. Left orphans, she and Shin were taken care of by the community as a whole. Like Ruri, both siblings had a natural talent for spirit arts, so Yuba ended up teaching them alongside her—treating them practically as family in the process. That's how she and Ruri became childhood friends.
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