As an everyday housewife -- notwithstanding her massive body and generous nature -- she led a quiet life. But this harmony was shattered when her lovely daughter disappeared. She and her daughter are of zoanthrope stock. After her daughter was abducted, she went on a quest to find her, the only clue being the kidnapper's steely eyes and insanely sardonic grin. Mitsuko's transformation was sparked by the powerful rage of maternal instinct depleting any control she once had over herself.