Itsuyo Saotome, the fifth daughter among nine sisters, holds the position of student council president at Hokuou Academy. Her striking appearance features a curvaceous frame, long black hair, and vivid purple eyes, accentuated by moles beneath one eye, on her neck, breast, and thigh. When transformed into her Valkyrie state, her hair sweeps into a ponytail, her eyes shift to a cross-patterned gaze, and she dons a white-and-purple uniform with a garter belt, flower-adorned cap, and wields the Holy Sword, The Chain—a weapon capable of commanding chains in battle.

Confident and fiercely self-assured, Itsuyo prides herself on her Valkyrie prowess, driven by a deep-seated father complex rooted in childhood memories of his approving head pats. This longing for paternal validation fuels her calculated aggression toward Takuma Akutsu, whom she initially views as a tool to bolster her strength and win her father’s favor. However, as Takuma’s protective nature and reliability mirror traits she admires in her father, her pragmatic alliance with him matures into genuine affection, revealing her capacity for emotional growth.

Assigned to safeguard Midgard from demonic incursions, Itsuyo battles alongside her sisters and Takuma, blending strategic acumen with her chain-wielding mastery. Her evolving dynamic with Takuma—from tactical exploitation to heartfelt partnership—highlights her struggle to reconcile duty with personal bonds, though her actions remain tethered to her father’s influence.

Her name, derived from the Japanese words for “five” and “night,” reflects her birth order, while her surname, meaning “early maiden,” underscores her identity as a devoted eldest sister and warrior.