Shijime is Sekirei #106. She was first mentioned in the first battle of the Third Stage of the Sekirei Plan by Kujika and Kuzuri as the third Sekirei in western Ashikabi Sanada Nishi's party and part of his trio of "Lovelies", later debuting in the hunt for the battle's prize. [1]
Appearance

Shijime appears to be a slender and short preteen girl, with blonde hair (white in the anime) and greyish-blue eyes. Her clothes are predominantly white, as she wears a baggy white sweater with long sleeves, a white veil-like sash held up by a black belt, a large white scarf (red in the anime), and black knee length boots.
Personality
Shijime's personality matches her childlike appearance. She's curious, easygoing, mischievous, naive, impulsive, friendly, and otherwise similar to human girls of her age.
Abilities and Powers
She seems to use her oversized sleeves to fight, also using her high degree of agility and speed to ambush and frustrate her enemies.
Norito: Her Norito appears to be special because it is executed together with Sanada's two other younger Sekirei. Similar to the Thunder twins' Norito.
Prayer: "These are the sleeves of my pledge. Smash and clear the wall before my Ashikabi!"[2]
History
Her and Benitsubasa seem to know each other due to their numbers being the closest to each other's. At some point, implied to be at the same time as her friends, Kuzuri and Kujika, she reacted to and was winged by Sanada.
Synopsis
Shijime debuted during the first match of the Third Stage of the Sekirei Plan. She discovers the Jinki largely by accident, encountering it while scurrying around the battlefield. Before she can present it to Sanada, she drops it, allowing Hayato Mikogami to secure it and win the match.
She later meets Kusano during the fourth match of the Third Stage of the Sekirei Plan. Along with Kuzuri and Kujika, she quickly grows fond of Kusano and considers her a close friend.[3]
She later appears during the Fourth Stage of the Plan on Kamikura Island, largely tormenting Himeko and getting into other mischief.