Yagyuu is one of the 5 main shinobi in Hanzo Academy. She is a quiet and stoic girl, with a dark past: She was inseparable from her younger sister, but lost her to a fatal car crash. As a permanent reminder of her sister, Yagyuu crafted an eyepatch from her hair ribbon, and wears it over her right eye. Since then, she has formed in inseparable alliance with her fellow shinobi Hibari, who reminds her a lot of her younger sister. Yagyuu knows she can't live without Hibari, developing a "bigger sister" complex and making sure she's always protected.