Soara Habaki, codenamed Arahabaki, is the illegitimate daughter of Chief Superintendent Hideaki Habaki. During her childhood, her father deceitfully offered her as a test subject to the Bastard Children of Sabaramond organization, describing the affiliated laboratory as a paradise. Instead, she endured at least ten years of painful and dangerous experiments, emerging as the sole survivor. Throughout this ordeal, she clung to a personal promise: if her father visited her even once, she would spare his life. He never came, cementing her resolve for vengeance. Her physical form reflects her traumatic history and combat existence. She possesses a fit, muscular build marked by numerous prominent scars. These include an X-shaped scar on her left cheek, parallel scars across her left collarbone and right shoulder, a stitched scar on her abdomen, and stitch scars encircling each arm. Her light-hued, short hair was formerly long and brunette. She typically wears trousers tucked into laced high boots and a sports bra, leaving her torso largely exposed during combat. The experiments fused her with magical beasts, granting enhanced physical abilities like significant strength and regenerative capabilities. However, she struggles to control her unstable beast-like transformations. Crucially, the core of the Twin-fanged Tiger—a magical beast contracted to the entity Corpse God—is embedded within her body. This condition led Majiri Agakura to classify her as a "layered magical beast." Driven by vengeance against her father, Soara returned to Japan. Working under a sorcerer affiliated with the Bastard Children and bearing the emblem of the fallen Byandy Empire, she accompanied her superior and an unnamed child to a Tokyo rooftop during a thunderstorm. She remained concealed while her father met her sorcerer boss. When Hideaki Habaki mistakenly declared she must be rejoicing in her grave for her service, the sorcerer corrected him, noting that phrase applies only to the dead. Soara then revealed herself, violently attacking her father. She crushed his wrist, snapped his ankle, and delivered repeated punches, declaring his pain insignificant compared to her decade of suffering. As she prepared a final blow, her father pleaded his usefulness in locating a sorcerer causing supernatural events. Before she could react, a sniper's bullet killed him instantly. Following his death, she immediately pursued his killers under her boss's three-minute time limit. She located the snipers, Hiro and Rinne Horojima, overcoming gunfire and scaling a building using a construction tarp. After disarming Rinne and bending the rifle barrel, she expressed fury at being denied her full revenge. She demanded their client's name but was interrupted by the arrival of Lisa Kuraki's troupe members. A brief confrontation ended with Soara toppling scaffolding as a distraction and escaping. During her escape, she heard a remark comparing her abilities to "Lemmings' level," sparking her interest in encountering others with similar capabilities in Shinjuku. Subsequently, she trains under Corpse God, focusing on controlling her unstable beast transformations—a direct consequence of the magical beast fusion experiments and the Twin-fanged Tiger core within her.