Mary Sera is a character from the anime and manga series Detective Conan. She is the younger sister of Shuichi Akai and the mother of Masumi Sera. Known for her intelligence and perceptiveness, Mary plays a mysterious role in the series, often seen guiding and advising her daughter Masumi. Despite her youthful appearance, she is actually an adult whose age was reverted due to an experimental drug, adding a layer of intrigue to her character. Her involvement with the Black Organization is a key plot point, contributing to the series' overarching narrative.