- Voice Actor (CV)
- Rie Kugimiya
- Gender
- Female
- Age
- 19
- Role
- Supporting
- Identity
- An anime-exclusive character affectionately known as 'Little White,' she is the twin sister of William (Little Black). Despite being born into a prestigious family of esper bloodline, Mary herself possesses no supernatural abilities—yet her very heart serves as the living core of the barrier that shields an entire city. She currently resides as a patient at St. Alaniad Central Hospital.
Personality
Cheerful & Energetic
Gentle & Empathetic
Occasionally Willful
Resilient Optimist
Mary, known fondly as 'Little White,' stands as one of the most emotionally resonant original characters crafted exclusively for the anime adaptation. Born into a lineage of espers yet devoid of any power herself, she was nonetheless chosen by fate in a profound way—her own heart functions as the living keystone of the city's protective barrier. A chance encounter with Leo in the hospital cemetery blossomed into a meaningful friendship that defined much of her journey. Even while ensnared under the influence of the Despair King and fully aware of the sacrifice that awaited her, Mary never let her radiant warmth fade. In the end, she embraced her destiny, giving her life to restore the barrier and protect both the city and every soul she held dear.