Yuba is Rio's paternal grandmother.
She is a practitioner of spirit arts and teaches spirit arts to Ruri and Sayo.
Yuba serves as the village chief.
Because of this, she is trusted by many people in the village.
One day, upon learning that Rio is the son of Zen and Ayame, Yuba revealed that she is his grandmother.
However, Yuba instructed Rio to keep this important fact a secret.
Additionally, Yuba took careful actions, such as sending a letter addressed to Gouki.
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