She set out with Tatsumi and Ieyasu to earn money for their village. 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. Tatsumi personally slays Aria after he is told the truth about Aria and her sadistic family. There is a chance that Tatsumi was in love with her, as the illusion that Zank showed revealed her to be the most important person in the world to him. 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.

Akame ga Kill!
Night Raid is the covert assassination branch of the Revolutionary Army, an uprising assembled to overthrow Prime Minister Honest, whose avarice and greed for power has lead him to take advantage of the child emperor's inexperience. Without a strong and benevolent leader, the rest of the nation is left to drown in poverty, strife, and ruin. Though the Night Raid members are all experienced killers, they understand that taking lives is far from commendable and that they will likely face retribution as they mercilessly eliminate anyone who stands in the revolution's way. This merry band of assassins' newest member is Tatsumi, a naïve boy from a remote village who had embarked on a journey to help his impoverished hometown and was won over by not only Night Raid's ideals, but also their resolve. Akame ga Kill! follows Tatsumi as he fights the Empire and comes face-to-face with powerful weapons, enemy assassins, challenges to his own morals and values, and ultimately, what it truly means to be an assassin with a cause. [Written by MAL Rewrite]