Minato Izutsumi

The older sister of Marin Izutsumi, she is a brilliant scientist with deep mastery over both medicine and pharmacology, operating publicly as a licensed physician. Her attachment to her younger sister borders on the pathological—an obsessive and indulgent devotion—while she remains entirely cold and self-serving toward anyone outside that relationship. She vanished following a significant incident she had a hand in, and had previously used a drug of her own creation to shrink both their bodies, driven by a personal desire to be closer to her sister.