Sakurako Christina Kujirase, known as Chris, was born in Shanghai to British parents and holds British nationality, consistently displaying refined social grace. A childhood incident during elementary school saw her accidentally detonate an explosive in a restroom, singeing her hair and cementing her preference for short blonde styles. This event steered her toward specializing in explosives and computer technology, where she exhibits significant aptitude.

At Mihama Academy, Chris acts as a de facto den mother, handling comprehensive domestic duties: cooking meals, cleaning dorms, managing laundry, and maintaining peers' bedrooms. Academically, she ranks eighth among 148 students and tutors struggling classmates. Due to poor eyesight, she wears contact lenses daily, reserving glasses only briefly between waking and morning routines.

Typically docile and pacifist, Chris adopts a stern, intimidating demeanor when provoked. She shares an aversion to firearms with instructor Haruto Aoi, carrying solely a defective standard-issue handgun. Her operations prioritize explosives and tech over conventional arms, often quipping during investigations: "Don’t hesitate to call for me if you do happen to step on a landmine."

Protective instincts define Chris’s role as supervising officer for transfer student Sengoku Taiga, involving lap-sitting, piggyback rides, and shared sleep where she instinctively holds Taiga’s chest. She playfully teases Tōka as "a classic Japanese cutie" and engages in group physical affection, including seminude embraces with Murasaki and Rena. These coexist with sudden sternness against perceived threats to peers.

Chris possesses a slim teenage frame (84-57-85cm) with a D-cup bust and teal eyes. Her standard Mihama uniform features practical accessories like pantyhose, headbands, and mobile devices. This blend of domestic diligence, academic skill, explosive expertise, and latent intensity shapes her multifaceted role within the academy.