Sayo was a young girl with long black hair and black eyes. She wore a white butterfly or flower hair accessory, and was often seen in plain cream-colored robes.
She was shown to be quick-tempered, kind, cheerful, and knowledgeable. She was a very strong-willed girl being able to hold onto hope while being tortured for an expended period of time.
Sayo had set out with Tatsumi and Ieyasu to earn money for their village in the Capital. On the way, they were attacked by night bandits and got separated. Sayo managed to stay with Ieyasu while Tatsumi was separated from them.
She and Ieyasu were then invited by Aria to her mansion, and she provided them with a meal that was drugged, making them lose consciousness. Sayo was then tortured to death, although she didn't submit to Aria and her family even until the moment of her death. Her torture had been more severe than Ieyasu's because Aria was jealous that a country girl had nice hair. Ieyasu told Tatsumi of what Aria did to Sayo and the latter admits to this act even bringing up her petty jealously. After he is told the truth about Aria and her sadistic family, Tatsumi personally slays Aria, avenging Sayo's death.
It is possible that Tatsumi was in love with her, as the illusion that Zanku created revealed her to be the most important person in the world to him.
Equipment and Skills
Sayo was seen carrying a bow and a stack of arrows. She seemed to have good combat abilities and presumably was a well-trained archer, as Tatsumi stated that both she and Ieyasu were strong.