Yuki Takamiya

About

A surly delinquent who (reluctantly) infiltrates the school as a spy to save her best friend. Despite her disdain for her underhanded allies, she stubbornly seeks the truth when everyone else has something to hide. Tough and caustic, but she's got a protective streak and a sharp mind.

(Source: 13 Sentinels: Aegis Rim Official Website)