Hajime emerges as a pivotal character shaped by a layered history and profound narrative weight. Born from abandonment, she endured experimental trials under the Minimum Agency, designated Success 0-1 after her latent Minimum ability—the Nihilist Minimum—awakened during a harrowing procedure. This power negates others’ Minimums, nullifies their effects, and triggers rapid regeneration, fueled by despair and emitting a passive aura of suppression.

Initially detached except when motivated by food, her guarded exterior masks a quiet empathy, often soothing others through shared meals. Her emotional growth unfolds visibly after Nice’s temporary disappearance, marked by safeguarding his headphones and stepping assertively into investigative roles. Physically, she stands out with inky-black hair, crimson eyes (shifting to pink-purple when her ability activates), and a signature sky-blue jacket paired with a white visor and red gloves.

A defining childhood moment occurred during her escape from Facultas Academy with Nice, who replaced her codename with “Hajime,” forging an unbreakable bond. Though her memories of their shared past initially faded, they resurface upon revisiting Facultas with Art and Momoka, reigniting her understanding of Nice’s irreplaceable role. Their dynamic intertwines mutual protection—seen in her sharing food during his turmoil and his readiness to deploy his powers for her safety.

Later arcs elevate her influence as she temporarily leads Hamatora following Nice’s presumed demise and grapples with her ability’s societal fallout, including Yokohama’s mass Minimum erasure. The story delves into her existential significance, alluding to her as the narrative’s “key” and a figure with an “undying body,” weaving subtle mythological weight into her existence.